Catch the wrong part (4)
I believe the answer is:
trap
'catch' is the definition.
(trapping is a kind of catching)
'the wrong part' is the wordplay.
'the wrong' indicates anagramming the letters.
'part' anagrammed gives 'TRAP'.
(Other definitions for trap that I've seen before include "Ambush" , "Vehicle" , "website?" , "Snare, ruse" , "Control ball" .)