Is acting in, it seems (7)
I believe the answer is:
appears
'seems' is the definition.
('appear' can be a synonym of 'seem')
'is acting in it' is the wordplay.
I cannot quite see how this works, but
'acting' could be 'a' (abbreviation, eg in job titles) and 'a' is present in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for appears that I've seen before include "Seems" , "Materialises" , "Becomes visible" , "Comes into sight" , "is exhibited" .)