Animated brat? (4)
I believe the answer is:
bart
'animated brat?' is the definition.
(I've seen this in another clue)
'animated brat?' is the wordplay.
'animated' indicates anagramming the letters.
'brat' anagrammed gives 'BART'.
(Other definitions for bart that I've seen before include "Branch of Islam" , "Small title-holder being a brat" , "Son in The Simpsons" , "Homer's son" .)