Unbalanced badly spoiled daughter (8)
I believe the answer is:
lopsided
'unbalanced' is the definition.
(I've seen this before)
'badly spoiled daughter' is the wordplay.
'badly' indicates anagramming the letters.
'daughter' becomes 'd'.
'spoiled' with letters rearranged gives 'lopside'.
'lopside'+'d'='LOPSIDED'
(Other definitions for lopsided that I've seen before include "Asymmetrical" , "Crooked" , "Not symmetrical" , "Unbalanced" , "not evenly distributed" .)