Actor McKellen (3)
I believe the answer is:
ian
'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 "- Botham, cricketer" , "Albert Beale's first name in EastEnders" , ". . . Botham, . . . Woosnam" , "- McEwan, Eng. writer" , "The familiar Dr Paisley" .)