1: Helps jazz musicians after the first (7)
2: Carelessly let teeth rot completely (2,3,6)
3: Essential part of Cayce's power! (3)
4: Trespass upon a moniker exploited by commercials (4,7)
5: Clothilda is carrying a parcel (3)
7: Lead around other green (7)
9: Perfume ingredient extracted from lamb ..... er, gristle (9)
13: Criticise a computer analysis of famous passage (6,5)
14: Put hot cocoa out for someone glued to the TV (5,6)
15: Gregorian chant emanates from unmelodious Anglo spin (9)
18: Furies, in ancient Greece or Ireland? Certainly! (7)
20: Shell compensate for loss in certain risky starts (7)
24: Odds of niece being born (3)
25: Behind and down and out (3)
26: Sounds like a bright child (3).