ACROSS
 1. <they judge> SUPREME COURT = (COMPUTER USER)*
 8. <just> PURELY = ←UP← RELY
 9. <most fat> PUDGIEST = PUD (_E inside GIST)
10. <divine image> IDOL = (I DO) + _L_
11. PORT + NILE* + SS = PORTLINESS <corporation>
12. GAG outside N_ = GANG <criminal syndicate>
14. <he may fight> SERVICEMAN = (RACISM EVEN)*
16. <uncle> PAWNBROKER = PAWN BROKER
18. "ROE TEA" = ROTI <bread>
19. (RATHER HOT)* B_ = HEARTTHROB <&lit>
22. ←BROS← = SORB <someone from East Germany>
23. <flawless> AIRTIGHT = AI RIGHT outside T
24. AD ROT outside I = ADROIT <expert>
25. <dressing down> REPRIMANDING = (.e)RE PRIM AND IN G(e.)

DOWN
 1. "STEAL" = STEEL <sword>
 2. <foot the bill> PAY UP = PA YUP
 3. <ruler> EMPEROR = PER inside ←ROME←
 4. <festival> EID AL-FITR = ←(.o)RT IF LADIE(s.)←
 5. <one using a map> ORIENTEER = _O_ _RIEN_ _TEER_
 6. RUES outside S_ = RUSES <cons>
 7. <Sikh institution> GURDWARA = ←(A RAW) DRUG←
13. <what makes electricity> GENERATOR = GREEN* + A TOR
14. ←MEGA TARTS← = STRATAGEM <clever scheme>
15. <one in belt> ASTEROID = A SET* + ←DIOR←
17. _K ERA + ←NIT← = KERATIN <protein>
20. <banish> EXILE = EX ←ELI←
21. <Indian side> BHAJI = B_ + HAJI
22. <shoot> SPRIG = S PRIG