1: Turn four in vessel (5)
2: Terrier shows how to stray (3)
3: Complain about the horse (3)
4: Short bloke quietly escaped seaweed (3)
6: Cronkite, Bradley, and Safer's first network (3)
8: Small piece of fish (3)
9: Satanic personification in 'Anthem A-Gogo' (5)
11: Child is to depart, finally (3)
12: Going after the final piece of puzzle for a very long time (3)