McKellen of "X-Men” (3)
I believe the answer is:
ian
'mckellen of x-men' 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 "... Fleming, author of the Bond books" , "- - Wallace (baritone)" , "Scottish John" , "Male" , "Albert Beale's first name in EastEnders" .)