Catch wrong prat (4)
I believe the answer is:
trap
'catch' is the definition.
(trapping is a kind of catching)
'wrong prat' is the wordplay.
'wrong' is an anagram indicator.
'prat' anagrammed gives 'TRAP'.
(Other definitions for trap that I've seen before include "get in net" , "Part (anag.)" , "ladder" , "The Web" , "one would be ill advised to enter?" .)