Scot, possibly, returning from Nairn (3)
I believe the answer is:
ian
'scot' is the definition.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ian that I've seen before include "- McEwan, Eng. writer" , "- - Wallace (baritone)" , "Scottish man's name" , "Male" , "Scotsman?" .)