Sage parent accepts head covering (7)
I believe the answer is:
mahatma
'sage' is the definition.
(term for a wise Hindu leader)
'parent accepts head covering' is the wordplay.
'parent' becomes 'mama' (mama is a kind of parent).
'accepts' indicates putting letters inside.
'head covering' becomes 'hat'.
'mama' going around 'hat' is 'MAHATMA'.
(Other definitions for mahatma that I've seen before include "Brahman sage" , "Hindu leader" , "(Indian) holy person or sage" , "Holy man" , "Savant" .)