Put down some mousetraps (3)
I believe the answer is:
set
'put down' is the definition.
(I've seen this in another clue)
'some mousetraps' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'SET' is hidden in the letters of 'mousetraps'.
(Other definitions for set that I've seen before include "Ready" , "Major segment of tennis match" , "Major division of tennis match" , "Firm, like jelly" , "several games" .)