A theatrical entrance (5,4)
I believe the answer is:
stage door
'a theatrical entrance' is the definition.
'stage door' can be an answer for 'entrance' (stage door is a kind of entrance). I'm not certain of the 'a theatrical' bit.
'theatrical entrance' is the wordplay.
'theatrical' becomes 'staged'.
'entrance' becomes 'oor' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'staged'+'oor'='STAGE-DOOR'
Can you help me to learn more?
(Other definitions for stage door that I've seen before include "Service entrance to theatre" , "Film" , "Theatre rear entrance" , "Company access" , "Actors' entrance/exit" .)