Track down wrong crate (5)
I believe the answer is:
trace
'track down' is the definition.
(I've seen this before)
'wrong crate' is the wordplay.
'wrong' indicates anagramming the letters.
'crate' with letters rearranged gives 'TRACE'.
(Other definitions for trace that I've seen before include "suspicion" , "Very small amount that can only just be detected" , "Detect - a small amount" , "Track down or make copy" , "plan" .)