A sea creature with a shell and flippers (6)

I believe the answer is:

turtle

(Other definitions for turtle that I've seen before include "Large marine reptile (with a fashionable neck!)" , "Sea creature like tortoise" , "Aquatic or terrestial reptile" , "Marine reptile with shell" , "Shelled marine creature" .)

I've seen this clue in the Sydney Morning Herald.

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