ACROSS
 7. <one pigeonholed> DOVECOTE = DO (E_C inside VOTE)
 8. <slight> LEAN <incline>
 9. <attendant of Jupiter> EUROPA = (A PURE)* outside O
10. TA + TT OO = TATTOO <military display>
11. K H + AN = KHAN <Asian ruler>
13. TEE RANGE* = TEENAGER <young person>
15. <French restaurant> CREPERIE = RECIPE* outside RE
17. <empty> BARE = "BEAR"
18. <fortune-teller> I CHING = ITCHING - T
20. <loses cool> PANICS = AN inside PICS
22. S_ from WRIST = WRIT <legal document>
23. TESTABLE* = SEAT BELT <safety equipment>

DOWN
 1. _T_ _OF_ _U_ = TOFU <vegan food>
 2. HEN outside ROI = HEROIN <horse>
 3. <dinosaur> EORAPTOR = ←ROE← + A P TOR
 4. <musical instruction to not play> REST = "WREST"
 5. REALTY* = ELYTRA <protection for fliers>
 6. (BOAT SURE)* = SABOTEUR <destroyer>
12. <dedicated> HARDCORE = R+D CO inside HARE
14. <illustration> EXEMPLAR = EX [-t]EMPLAR
16. <pedestal> PLINTH = P_ L_ I_ N_ T_ H_
17. <our cousin> BONOBO = NO inside BO BO
19. <squall> GUST = TUGS*
21. <lower> CALF <part of leg>