Ill-bred fellow caught having fling (5)
I believe the answer is:
churl
'ill-bred fellow' is the definition.
(thesaurus)
'caught having fling' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'having' means one lot of letters go next to another.
'fling' becomes 'hurl' (I've seen this before).
'c'+'hurl'='CHURL'
(Other definitions for churl that I've seen before include "Graceless person" , "Mean-spirited person" , "Mean-spirited, graceless type" , "Bad-tempered person" , "Rude and mean-spirited fellow" .)