ACROSS
 9. PERCH ACE outside _N = PERCHANCE <maybe>
10. X inside EUR B_ = EXURB <residential area>
11. <legendary bird> ROC = ←OR← + C_
12. (MILD GRANDEE)* = LARGE-MINDED <magnanimous>
13. ⭯PAVES⭯ = VESPA <motorised scooter>
15. <ravishment> SEDUCTION = 🇫🇷OF THE🇫🇷 inside SECTION
16. <hawk> REDTAIL = D inside RETAIL
18. →"KEIR MATTE"← = MEERKAT <Timon?>
20. <ways to refute> DISPROOFS = DI + SPOOFS outside R
22. _Y EATS = YEATS <Irish poet>
24. <dramatic display> SHOWMANSHIP = (SHOW MAN'S HIP)
26. <regret> RUE = [-t]RUE
27. (ANG LE[-e]) = ANGLE <perspective>
28. <play> TOLERANCE = TRANCE outside ←ELO←

DOWN
 1. <who'd sign> APPROVER = A PP ROVER
 2. <costs> PRICES = PR ICES
 3. _R _H _Y _L = RHYL <seaside resort>
 4. ←LOSER← after ENT = ENTRESOL <mezzanine>
 5. <Cardiff's parliament> SENEDD = (.o)SENED D(i.)
 6. O_ inside MEDIC RELY = MEDIOCRELY <without notable skill>
 7. <better at indulging> OUTDRINK = (IN TUDOR)* + K
 8. I BAN outside DA = IBADAN <Nigerian city>
14. <mixed up> ANAGRAMMED = A NAG + RAM ME _D
17. <drive away> DISLODGE = (ISLAND - AND) inside DODGE
18. MES SHALL = MESS HALL <canteen>
19. T_U S_K E_G E_E = TUSKEGEE <Alabama college>
20. <gloomy> DISMAL = (.n)D IS MAL(i.)
21. <fancy> ORNATE = (ART ONE)*
23. _AI_ + RING = AIRING <on>
25. <country> PERU = ←(.t)URE P(o.)←