Across:
8 Fatherly type (CLERIC) of white-collar worker? (CLERIC),
9 Fixed (= anagram indicator) tie clip (tie clip = E-PLICIT) containing cross (-X-) (EXPLICIT) – that’s crystal clear (EXPLICIT)
10 Is not short (TALL) of covering up parental leave (covering up ‘parenTAL Leave’ = TALL),
11 In due course (AFTERWARDS) was redraft (was redraft) wrong (= anagram indicator)? (AFTERWARDS),
12 Take for granted (ASSUME) part of the overseas sum earned (part of ‘overseAS SUM Earned’ = ASSUME),
14 It’s hard to believe (TALL TALE) 10 across (‘tall’ = TALL) is with tenor (T-) on the beer (-ALE) (TALL TALE),
15 A number of instruments on display (PANEL) at rock (= anagram indicator) discos in US (discos in US = DISCUSSION) (PANEL DISCUSSION) for Talking Heads (PANEL DISCUSSION for talking heads),
18 Drunk (= anagram indicator) porter (porter = RE-PTOR) outside church (Church of England = -CE-) (RECEPTOR) has a nerve – apparently responding to seeing the light! (RECEPTOR transmits signal to sensory nerve),
20 Clean your spark plugs (TUNE UP) in backward (= reverse indicator) place (put = T- UP) around hill on a beach (dune) that needs no introduction (d) (‘dune’ without ‘d’ = -UNE) (TUNE UP),
22 Soothe (CONTENT-) one that is charged (-ION) (CONTENTION) with allegation (CONTENTION),
24 Meredith has no time (‘Meredith’ has no ‘time’ = redh = HERD) for that type of mentality (HERD mentality),
25 Distribution (ISSUANCE) of edition (issue = ISSU-E) covering party in Africa (African National Congress = -ANC-) (ISSUANCE),
26 Colour sergeant doesn’t get rest cure (‘colour sergeant’ doesn’t get ‘rest cure’ = ologan = LAGOON) by inland lake (LAGOON).
Down:
1 Brings up (= reverse indicator) the foreign ('the' foreign = la = AL-) course (-WAY) at school (-S) (ALWAYS) without fail (ALWAYS),
2 Central to backward (= reverse indicator) popular opinion (central to ‘popuLAR Opinion’ = laro= ORAL), in a manner of speaking (ORAL),
3 Get it in the neck from the butcher (SCRAG END) in post (send = S- END) over Charlie (-C-) contacting paper (-RAG) (SCRAG END),
4 Region (BELT) in Belgium (BE-) around Liège and Ghent (around ‘Liège and ghenT’ = -LT) BELT),
5 Shreds (rips) reviews (= reversal indicator) (rips = SPIR-) for leads from Abbey, Lyric (leads from ‘Abbey Lyric’ = -AL) (SPIRAL) and Helix (helix = SPIRAL),
6 Contract (d) offer (bid) (‘bid’ without ‘d’ = BI-) is blindly loyal to one side (-PARTISAN) (BIPARTISAN) in agreement involving more than one party (BIPARTISAN),
7 French wine (Bordeaux/French ‘wine’ = VIN-) for young man (lad) sent back (= reversal indicator) (lad = -DAL-) with duck (-O-) order (-O) (VINDALOO), a speciality of Indian restaurant (VINDALOO),
13 Never a dull moment (-EVENTFUL) following (= position indicator) a Parisian (‘a’ in Paris/French = UN-) (UNEVENTFUL) routine (UNEVENTFUL),
14 Person checking food for impurities (taster) removed bone (t-bone = ‘t’) (‘taster’ without t’ = TASER) – the stunning type (TASER),
16 Number one (s) from Slade (slade /dale) (‘dale’ without ‘d’ = ALE-) associated with audience (-HOUSE) (ALEHOUSE) in watering hole (ALEHOUSE),
17 Solve the mystery (UNTANGLE) with one nice (Nice/French ‘one’ = UN-) twist (-TANGLE) (UNTANGLE),
19 Temporary dwelling (tent = TEN-T) accommodating a (-A-) new (-N-) (TENANT) occupant (TENANT),
21 Pull out (UPROOT) of this place (this place) in a manner of speaking (= homophone indicator) (‘this place’ = ‘displace’ = UPROOT),
23 The odd wild yeast (odd letters of ‘wIlD yEaSt’ = IDES) in time for mid-March (IDES),
24 Whopping great (HUGE) sides on humpback bridge (sides on the ‘HUmpback bridGE’ = HUGE).