Someone in The Imitation Game , perhaps? (5)
I believe the answer is:
actor
This could be a double definition.
'someone in the imitation' is the first definition.
'actor' can be an answer for 'someone' (actor is a kind of someone). I am unsure of the 'in the imitation' bit.
'game perhaps?' is the second definition.
(I know this)
(Other definitions for actor that I've seen before include "One on stage" , "Theatrical performer" , "Croat (anag.)" , "Theatre player" , "eg Anthony Hopkins" .)