Naughty child with a little dimple (3)
I believe the answer is:
imp
'naughty child' is the definition.
(informal term for a misbehaving child)
'with a little dimple' is the wordplay.
'with' says the answer is hidden in the clue.
'IMP' is hidden in the letters of 'little dimple'.
(Other definitions for imp that I've seen before include "Goblin" , "Pixie" , "A little devil of mischief" , "Sprite; add feathers to" , "A mischievous little devil" .)