Brat's opposite (5)
I believe the answer is:
angel
'brat's opposite' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for angel that I've seen before include "Person of beauty, purity or kindness?" , "Investor for show" , "Heavenely messenger" , "Theatre backer" , "Messenger < is a nurse" .)