A Fish Called Wanda essentially left out on reflection (3)

I believe the answer is:

gar

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'a fish' is the definition.
(type of gar)

I cannot understand how the rest of the clue works.

(Other definitions for gar that I've seen before include "Pike-like fish" , "Creature" , "Type of fish" , "swimmer" , "something fishy here" .)

I've seen this clue in The Times.

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