Crossword Genius

Lay some mousetraps (3)

Ross

I believe the answer is:

set

'lay' is the definition.
(I know that lay can be written as set)

'some mousetraps' is the wordplay.
'some' indicates the answer is hidden within 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 "Mount (gem); scenery" , "declined" , "Series of tennis games" , "Go below the horizon," , "See 16 Down" .)

I've seen this clue in the Evening Standard.
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