Fish in lake one in dinghy catches (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 remainder of the clue.

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

I've seen this clue in The Sun.

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