Just what you'd expect of an actor when he's working (2,9)
I believe the answer is:
in character
'just what you'd expect' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'an actor when he's working' is the wordplay.
I cannot really see how this works, but
'an' could be 'i' (Roman numeral for one) and 'i' is located in the answer.
'actor' could be 'character' (character actor is a kind of actor) and 'character' is found within the answer.
A single letter 'n' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for in character that I've seen before include "True to type" , "Typical" , "Appropriate for the part" , "Dressed for the part" .)