ACROSS
1. (CYPRIOT MAN)* = PATRONYMIC <family name>
7/19. <window> OEIL-DE-BOEUF = O_ ←BED LIE← OEUF
9. BOOS outside ←ET← = BOOTES <stars>
10. <computing unit> TERAFLOP = ←(...r)POL FARE T(e...)←
11. BET outside (ANNE R) = BANNERET <high-ranking knight>
12. (AL HS) outside EP = ALEPHS <letters in Hebrew>
13. S_ CUT = SCUT <tail that sticks up>
15. <compassion once> MISERICORD = MISER I + CORD
17. <stuck in> HOUSEBOUND = (USE BO_) inside HOUND
20. <keep this> STET = SET outside T
21. J_E JUNE = JEJUNE <of zero interest>
23. <balanced character description> AMBIVERT = VERBATIM*
25. GAZED outside UMP = GAZUMPED <accomplished Con preventing another party taking House?>
26. <shut up> ENCAGE = CA inside (HENGE - H)
27. <'Fast and Furious' driver> JEHU = J + _E _H _U
28. <big player> BASS FIDDLE = DISABLED* outside SF

DOWN
2. <old public space> AGORA = AGO + _RA_
3. ←SIT-IN ITER← = RETINITIS <infirmity of vision>
4. <snake oil> NOSTRUM = S_ inside NOT RUM
5. <having made necessary alterations> MUTATIS MUTANDIS = M TATI inside ((U AND IS) outside SMUT)
6. <pirate> CORSAIR = "COURSE HEIR"
7. <shop selling alcohol informally> OFFIE = OFFE_ outside I
8. <train> IRON HORSE = (_H_ _O_) inside RENOIRS*
14. <making barrels> COOPERAGE = G←T, COOPERATE
16. ←(...i)DE CAVES A C(l...)← = CASEVACED <transported soldiers injured in battle>
18. <boozer> BREWPUB = B_R _E _W_P_ U_ + B_
22. UUU outside H, outside R = UHURU <freedom from colonisation>
24. <Hunter's shiner> RIGEL = LIGER, R↔L