A little bounder; bit of a crook (3)
I believe the answer is:
roo
'a little bounder' is the definition.
(I've seen this in another clue)
'bit of a crook' is the wordplay.
'bit of' indicates the answer is hidden within the clue.
'ROO' is hidden within 'crook'.
(Other definitions for roo that I've seen before include "young skipper" , "Kanga's child (Milne)" , "Australian jumper" , "Marsupial (abbrev.)" , "Kanga's son (Pooh)" .)