Key issue of doctor visiting family at home (7)
I believe the answer is:
kingpin
'key issue' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'doctor visiting family at home' is the wordplay.
'doctor' becomes 'GP' (general practitioner).
'visiting' means one lot of letters goes inside another.
'family' becomes 'kin' (synonyms).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'kin'+'in'='kinin'
'gp' inserted inside 'kinin' is 'KINGPIN'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for kingpin that I've seen before include "Ring leader" , "Essential person in organisation" , "Main bolt" , "Crucial person in organisation" , "VIP" .)