She appears in comedies (4)
I believe the answer is:
demi
'she appears in comedies' is the definition.
I know nothing about this answer so I can't judge whether this works.
'she appears in comedies' is the wordplay.
'she' becomes 'em'.
'appears in' means one lot of letters goes inside another.
'comedies' becomes 'di' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'em' put within 'di' is 'DEMI'.
Can you help me to learn more?
(Other definitions for demi that I've seen before include "Half-sized" , "Half for a dime" , "Prefix for half or part" , "-- Moore, actress" .)