Leave a musical production in success (3,2)
I believe the answer is:
hop it
'leave' is the definition.
(I've seen this before)
'a musical production in success' is the wordplay.
'a musical production' becomes 'op' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' is an insertion indicator.
'success' becomes 'hit' (hit is a kind of success).
'op' placed inside 'hit' is 'HOP IT'.
Can you help me to learn more?
(Other definitions for hop it that I've seen before include "On your bike!" , "Run along now!" , "Scarper, be gone" , "Go away (colloq.)" , "get lost" .)