Across:
8 Women (W-) from Britain (-B-) in Asia (Asia) mixing up (= anagram indicator) (Asia = -ASA-I) (WASABI) hot condiment (WASABI),
9 Can’t tail (can’t tail) criminal (= anagram indicator) (can’t tail = ATLANTIC) going back and forth between here and America (ATLANTIC),
10 De Gaulle fails to get deal (‘De Gaulle’ fails to get ‘deal’ = gule = GLUE) to stick (GLUE),
11 Approach of a dictator (TYRANNICAL) confusing (= anagram indicator) clarity (clarity = TYR-ICAL) about woman (-ANN-) (TYRANNICAL),
12 A skier (a skier) travels (= anagram indicator) (a skier = KAISER) over old German mountains and other bits of land (KAISER),
14 Horse (bay = B- -AY) possesses chromosome (-Y chromosome) for muscular strength (thew) – in the words of old writer (‘muscular strength’ in a literary sense = thew = THE W-) (BY THE WAY), incidentally (BY THE WAY),
15 Gas (AIR-) for one of the beers (-CRAFT beers) and porter (CARRIER) (AIRCRAFT CARRIER) from a huge navy vessel that’s often found in port (AIRCRAFT CARRIER),
18 Models oneself on (EMULATES) bird (EMU-) on shift-work (-LATES)? (EMULATES),
20 Baby (mollycoddle/pamper = CODDLE) food? (Dublin CODDLE),
22 Novel ideas (STORYLINES) for bars (-LINES) closing (= position indicator) similar to 2 down (STORY- similar to ‘tale’) (STORYLINES),
24 Set of standards (CODE) for banks countrywide (banks ‘COuntrywiDE’ = CODE),
25 Kept captive (PRISONER) by endless (k) uncertainty (‘risk’ without ‘k’ = -RIS-) for individual (-ONE-) in our voting system (PR voting system = P-R) (PRISONER),
26 Nosey Parker dismisses Karen (‘nosey parker’ dismisses ‘Karen’ = oseypr = OSPREY) Hawk (OSPREY).
Down:
1 Review (= reversal indicator) had (had = DAH-) fairly (half of) lied (half of ‘LIed’ = -LI-) about introduction (‘About’ introduction = -A) (DAHLIA) by Mexican type in the plot (DAHLIA),
2 Temperature (T-) of drink (-ALE) (TALE) and whopper? (whopper/lie = TALE),
3 Waiters (waiters) serve (= anagram indicator) (waiters = WISTER-A) Indian starter (‘Indian’ starter = -I-) inside (WISTERIA) – it’s from the pea family (WISTERIA is from the pea family),
4 Fête (FAIR) in French (F-) State (state/express = -AIR) (FAIR),
5 Engineer (-E-) works (PLAN-T) outside (PLANET) with mercury (Mercury PLANET),
6 Set up (ENGINEER-) journalist (-ED) (ENGINEERED) to be manipulated (ENGINEERED),
7 Cleric (VICAR-) loses the head (s) with one of the wise chaps (‘sage’ without ‘s’ = -AGE) (VICARAGE) in the minister’s home (VICARAGE),
13 Profane belief (SECULARISM) in Lear’s music (Lear’s music) melody (= anagram indicator) (Lear’s music = SECULARISM),
14 No cure in Bucharest (no ‘cure’ in ‘Bucharest’ = bhast = BATHS) for the old swimmers (BATHS),
16 Goes up (= reversal indicator) road (MI = IM-) to fully developed (-MATURE) (IMMATURE) green (IMMATURE),
17 Model (= anagram indicator) cares not (cares not = ANCESTOR) for great, great-grandfather, for example (ANCESTOR),
19 Genius (TALENT) from old Roman capital? (old Roman capital/money coin = TALENT),
21 Some unprincipled Germans (some ‘unprincipLED GERmans’ = LEDGER) produced one of the books (LEDGER),
23 No gin in the morning (no ‘gin’ in the ‘morning’ = morn = NORM) – that goes without saying! (NORM),
24 Trump’s (trumps/outplays = CAPS) precautions lack routine (‘precautions’ lack ‘routine’ = pcas = CAPS).