Crossword Genius

Fisherman's trick? (5)

Ross

I believe the answer is:

catch

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'fisherman's' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'trick?' is the second definition.
(I've seen this in another clue)

Can you help me to learn more?

(Other definitions for catch that I've seen before include "Understand" , "a sort of 22" , "Be in time to see" , "Good match" , "problem in small print?" .)

I've seen this clue in the Evening Standard.
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