Catches a sprat? (5)

I believe the answer is:

traps

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'catches' is the definition.
(trapping is a kind of catching)

'a sprat?' is the wordplay.
'sprat' anagrams to 'TRAPS'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for traps that I've seen before include "Captures" , "bunkers" , "Devices to catch, animals say" , "Corners" , "tricks" .)

I've seen this clue in the Evening Standard.

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