ACROSS
 7. ←MAC← I = CAMI <negligee>
 8. <successful> PROSPERING = PROS' PE RING
10. SAN ←FIRES← = SANSERIF <type>
11. <suitably talented> CUT OUT = CU TOUT
12. (REAL MADRID)* = RED ADMIRAL <winger>
14. <wrestling> SUMO = SUM O
16. <occult> SECRET = ←TERCES←
18. <cringeworthy> TRAGIC = TIC outside RAG
20. <staunch> STEM <London Pride {flower} supporter>
21. ENTER PRISE = ENTERPRISE <business>
23. <do> DREADS = D_ READS
25. <proposal> OVERTURE = OVERTUR[-n] E
27. PORT LINE SS = PORTLINESS <corporation>
28. <miss> NEED = NEE D

DOWN
 1. (MAGNATE MEN)* = MANAGEMENT <executive>
 2. <party> FIESTA = (.i)FIES TA(x.)
 3. ←RAPS← = SPAR <fight>
 4. <investor> SPECULATOR = _S PECULATOR
 5. PATRIOTS* = PROTISTA <historical kingdom>
 6. (.a)UNA U(n.) = UNAU <sloth>
 9. COFFERS - C = OFFERS <suggestions>
13. M OTHERS HIP = MOTHER SHIP <headquarters?>
15. TERMINATES* = MAIN STREET <somewhere downtown>
17. <fortifications> RAMPARTS = ←STRAP MAR←
19. <comfortable> AT HOME = [-f]ATHOME[-d]
22. <stout> ROTUND = TUN inside ROD
24. <bounders> ROOS = "RUSE"
26. <moderate> EASE = _E_A_S _E_