Scottish form of John (3)
I believe the answer is:
ian
'scottish form of john' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ian that I've seen before include "Sir - McKellen, actor" , "Albert Beale's first name in EastEnders" , "- Fleming (James Bond)" , "The familar Dr Paisley" , ". . . Botham, . . . Woosnam" .)