Crossword Genius

Does it show irritation at having been caught? (7)

Ross

I believe the answer is:

snapper

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'it show irritation at having been caught?' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand how the remainder of the clue works.

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(Other definitions for snapper that I've seen before include "sharp-toothed fish" , "Fish; photographer" , "Person photographing" , "Fish; marine turtle" , "(Often red) food fish" .)

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