1: Shiny flat-bottomed boats heading north (5)
4: Great flow dissipated into phosphorescent aura (9)
9: Gorilla taking head off at it's base! (3)
10: Bolt I have inserted in right frame (5)
11: Carried on with wit,energy and a little determination (5)
12: Agent returned carrying yen in a container (7)
13: Machine spindle starting to mistime; also about to begin labouring (7)
14: Loses ones extraordinary flexibility (9)
15: Alcohol and tobacco - they can get a grip on you, we hear (5)
17: Oddballs go right to Kansas (5)
18: I bang rock, disturbing snake (4,5)
21: Non-professional laggard goes underground (4,3)
25: Sailor turned up; against operatic song in West German region (7)
26: Skipped the French army physical training (5)
27: Lazy person paid Leroy a little (5)
28: I've lost struggle (3)
29: Simple addition in cult film (4,5)
30: Home that's high (and very light) by the Sound (5)