Scotsman in Belgravia now (3)
I believe the answer is:
ian
'scotsman' is the definition.
(common Scottish name)
'in belgravia now' is the wordplay.
'in' says the answer is hidden in the clue.
'IAN' is hidden in the letters of 'belgravia now'.
(Other definitions for ian that I've seen before include "Male" , ". . . Botham, . . . Woosnam" , "- - Wallace (baritone)" , "The familar Dr Paisley" , "... Fleming, author of the Bond books" .)