Minute Cryptic

Our definition here is 'flipper?' and our answer will be another word for that.

This clue's indicators are 'goes overboard', 'after' and 'swings'. One of these is a deletion indicator - we'll remove some fodder from other fodder. Another is a reversal indicator guiding us to rotate a word, reversing the order of its letters. And 'after' is a simple repositioning indicator - take what precedes it and put it after what follows.

This clue's fodder is 'Boat', 'life-ring' and 'orca'. We'll need to find a short substitute for one of these and use it with the letters of the others to construct our answer, as guided by the clue's indicator(s).