Fish struggle to stay afloat (8)

I believe the answer is:

flounder

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'fish' is the definition.
(flounder is a kind of fish)

I can't explain the remainder of the clue.

(Other definitions for flounder that I've seen before include "Small flatfish" , "Struggle in water" , "A fish; be out of depth" , "small swimmer" , "Fish -- stumble helplessly" .)

I've seen this clue in The Times.

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