In the end, did you policemen mean to search me? (5)
I believe the answer is:
dunno
'search me?' is the definition.
(I've seen this in another clue)
'in the end did you policemen mean to' is the wordplay.
'in the end' says to take the final letters.
The last letters of 'did you policemen mean to' are 'DUNNO'.
(Other definitions for dunno that I've seen before include "I've no idea!" , "search me" , "I don't know (informal)" , "It beats me" , "I can't help" .)