Cricketer, lbw, is prone to come a cropper (4,6)
I believe the answer is:
spin bowler
'cricketer' is the definition.
(I've seen this before)
'lbw is prone to come a cropper' is the wordplay.
'to come a cropper' indicates anagramming the letters (I've seen 'comes a cropper' mean this (to come a cropper is to meet with disaster)).
'lbw'+'is'+'prone'='lbwisprone'
'lbwisprone' anagrammed gives 'SPIN BOWLER'.
(Other definitions for spin bowler that I've seen before include "Cricket player" , "Cricketer" .)