Perhaps Doris is nursing in former African kingdom (7)
I believe the answer is:
dahomey
'former african kingdom' is the definition.
The answer and definition can be both locations as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'perhaps doris is nursing in' is the wordplay.
'perhaps doris' becomes 'Day' (actress Doris Day is an example).
'is nursing' is an insertion indicator.
'in' becomes 'home' ('he's in' can mean 'he's home').
'day' placed around 'home' is 'DAHOMEY'.
Can you help me to learn more?
(Other definitions for dahomey that I've seen before include "old African country" , "Benin some time ago" , "Former name of Benin; O my head (anag.)" .)