Mother mellowed getting spoiled (7)
I believe the answer is:
damaged
'spoiled' is the definition.
(thesaurus)
'mother mellowed getting' is the wordplay.
'mother' becomes 'dam' (female parent of an animal).
'mellowed' becomes 'aged' (I've seen this in another clue).
'getting' is a charade indicator (letters next to each other).
'dam'+'aged'='DAMAGED'
(Other definitions for damaged that I've seen before include "Impaired" , "in poor condition" , "Hurt" , "Marred" , "Harmed, injured or spoiled" .)