"X-Men" actor McKellen (3)
I believe the answer is:
ian
'x-men actor mckellen' 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 "Scotsman?" , "The familar Dr Paisley" , ". . . Botham, . . . Woosnam" , "- McEwan, Eng. writer" , "Boy's name (Scottish?)" .)