1: Words can be arranged to be cutting. (5)
2: I've lost struggle (3)
3: Observed no Knight (5)
4: Goes through ere sixpence circulates (11)
5: Pious woman in underground hideaway (3)
6: Collector is slow mover garnering southern selenium (9)
7: Telegraph about ancient city can be fixed (7)
8: Aroused with short tutu, mesmeric midsection, and perfume (9)
12: Carelessly let teeth rot completely (2,3,6)
14: Per Rev. Spooner, instrument in Hef's bedroom for sensitive area (5,4)
15: Family member suppresses a temptation to go head-to-foot naked (2,7)
18: Stays concerned with water pipes (7)
22: Blow the whistle on the end of Chinese burn (5)
23: Gloomy semi-dull firmament (5)
25: Solo, the pilot rises? No way (3)
27: Neil lost a letter and ended up with nothing (3)