Catch drunken prat (4)
I believe the answer is:
trap
'catch' is the definition.
(trapping is a kind of catching)
'drunken prat' is the wordplay.
'drunken' indicates anagramming the letters.
'prat' with letters rearranged gives 'TRAP'.
(Other definitions for trap that I've seen before include "Control ball" , "fault" , "Trick" , "Part (anag.)" , "Snare; light carriage" .)