Take care of silver in bushy head of hair (6)
I believe the answer is:
manage
'take care of' is the definition.
(thesaurus)
'silver in bushy head of hair' is the wordplay.
'silver' becomes 'ag' (Ag is the chemical symbol for silver).
'in' indicates putting letters inside.
'bushy head of hair' becomes 'mane'.
'ag' inserted within 'mane' is 'MANAGE'.
(Other definitions for manage that I've seen before include "Handle and control the business" , "Run; cope" , "Control, direct, run" , "Control; cope" , "Handle, run" .)