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' indicates a hidden word (some parts of the word are used).
'SET' is hidden within '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" .)