Crossword Genius

Acrobatic swimmer (7)

Ross

I believe the answer is:

dolphin

(Other definitions for dolphin that I've seen before include "Sociable sea mammal, sacred in ancient Greece" , "Small sociable whale" , "Sea-mammal" , "Small (bottlenosed) whale" , "Marine mammal with an elongated beak-like head" .)

I've seen this clue in The Telegraph.
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