Robe of doctor in family circle (6)
I believe the answer is:
kimono
'robe' is the definition.
(I know that kimono is a type of robe)
'doctor in family circle' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'in' is an insertion indicator.
'family' becomes 'kin' (synonyms).
'circle' becomes 'O' (O is a circle).
'mo' going into 'kin' is 'kimon'.
'kimon'+'o'='KIMONO'
'of' is the link.
(Other definitions for kimono that I've seen before include "Japanese loose, sashed garment" , "Traditional robe in Japan" , "Eastern robe" , "Loose robe, originally Japanese" , "Japanese-style dressing gown or robe" .)