ACROSS
 1. SCAN TIER = SCANTIER <covering less>
 6. <&cd> BELFRY {physically elevated tollings of bells with notes, in this location}
 9. <stew> SNIT = ←TINS←
10. <principal> INVESTMENT = IN VESTMENT
11. <git> BEGONE = EG inside BONE
12. (MINOR ACT)* = ROMANTIC <loving>
13. <passing> OVERTAKING = OVERT A KING
16. <identifies> TAGS = ↺STAG↺
17. <scrap> ATOM = (A TO M)
18. <secretly remove> EXFILTRATE = EX FILTRATE
20. CO ROTTEN* = CORNETTO <dessert>
22. [-l]IGNITE = IGNITE <fire>
24. <alcoholism> DIPSOMANIA = DIPS OMANI A
25. "BORE" = BOHR <physicist>
26. <insist upon> STRESS = S TRESS
27. ←(A TAD)← BASE = DATABASE <records>

DOWN
 2. <green> CONSERVATIONIST = (VINES CARTOONIST)*
 3. ←OR TIN← = NITRO <explosive>
 4. TINE inside IRATE = ITINERATE <ramble>
 5. (.t)RE VERSI(f.) = REVERSI <Othello>
 6. BOOM outside S = BOSOM <bust>
 7. ←ROT ANIMAL← = LAMINATOR <preserver>
 8. <they embroider> RUNNING STITCHES = RUNNING STITCHES
14. <recall> REMINISCE = (ICE MINERS)*
15. IV inside GALLANT = GALLIVANT <jaunt>
19. FR OWNED = FROWNED <seemed confused>
21. <measured length of> TIMES <rag>
23. <tycoon> NABOB = "NAY" BOB