Family doctor at home for head honcho (7)
I believe the answer is:
kingpin
'head honcho' is the definition.
(I know that kingpin is a type of head honcho)
'family doctor at home' is the wordplay.
'family' becomes 'kin' (synonyms).
'doctor' becomes 'GP' (general practitioner).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'kin'+'gp'+'in'='KINGPIN'
'for' is the link.
(Other definitions for kingpin that I've seen before include "Essential person in organisation" , "Most important member of organisation" , "Pink gin for indispensable person" , "Group leader" , "person with vital role" .)