Man's man? (7)
(Other definitions for douglas that I've seen before include "bloke" , "Manx capital" , "Capital of the Isle of Man" , "See 13" , "place of Man" .)
'mans man?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
This is the entire clue.
Can you help me to learn more?
(Other definitions for islander that I've seen before include "Lesbian for one" , "Inhabitant of a detached area" , "One from e.g. Skye" , "Corsican, for example" , "Person inhabiting Aran, say" .)