Crossword Genius

Blue fish not caught (3)

Ross

I believe the answer is:

sad

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'blue' is the definition.
(similar in meaning)

I don't understand the rest of the clue.

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(Other definitions for sad that I've seen before include "Downcast" , "upset" , "Dejected" , "Doleful" , "Disconsolate" .)

I've seen this clue in The Times.
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