Cryptic crossword No 3,658

Across

1. Infant’s father is tense being associated with artistic movement (7)
2. Wacky, endless anecdote including a pest settling in Australia (4,4)
3. Groovy music from Tool? (6)
4. Frequent squatter starts to organise payment of substantial amount of money (7)
5. Misguidedly assault Iran for southern nationals (11)
6. East End tramp’s highly flammable liquid (8)
7. Discourage inmate misbehaving: settled (11)
8. Errands regularly taken on by US work animal (8)
9. Fly from Thailand with group to borders of Singapore (6)
10. Spineless ones with camouflaged arms? (6)
11. Tree huggers return fine unfortunately (6)
12. Wolves, deceivers… vermin (4,4)

Down

1. Maybe Volkswagen reversed right instead of left to get amphibian (4)
2. Some, not all erections reaching higher point (6)
3. Stroked Cynthia's skin before bringing up unfinished pudding (8)
4. Boxer fighting ok with a groan (8)
5. Realised careers of the stars (8)
6. Herb (in Chicago) playing clarionet without energy… (8)
7. …and the other people left accept refrain occasionally (2,6)
8. Old friend’s a gem (4)
9. Six-footer joins cult (6)
10. Sign of healing seen in mollusc abnormality (4)
11. Strong dislike of athletic type (8)
12. Dune director changes position with new state of attire (4)
13. Finale of SNL impersonation shows lack of scope (10)
14. One cold-blooded fellow found in leaves by emergency room (10)