Father's clothing sorcerer ruined (7)
I believe the answer is:
damaged
'ruined' is the definition.
(damaged or destroyed)
'father's clothing sorcerer' is the wordplay.
'father' becomes 'dad' (informal term for father).
'clothing' indicates putting letters inside (some letters cover up or clothe others).
'sorcerer' becomes 'mage' (I've seen this in another clue).
'dad' going around 'mage' is 'DAMAGED'.
(Other definitions for damaged that I've seen before include "Hurt" , "Sullied or harmed" , "in poor condition" , "Impaired" , "Harmed, injured or spoiled" .)