Somebody maybe taking a punt eating tail of foul fish (7)

I believe the answer is:

bloater

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

I don't understand the rest of the clue.

(Other definitions for bloater that I've seen before include "Herring salted and smoked" , "Something fishy" , "Partially dried herring" , "Cured herring" , "that will more than fill one up" .)

I've seen this clue in The Times.

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