He's back from Nairn (3)
I believe the answer is:
ian
'he's' is the definition.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ian that I've seen before include "The familiar Mr Paisley" , "Scottish man's name" , "- - Wallace (baritone)" , ". . . Botham, . . . Woosnam" , "- Fleming (James Bond)" .)