Stage? Run out to play guitar, perhaps (7)
I believe the answer is:
rostrum
'stage?' is the definition.
(a rostrum is a raised platform or stage)
'run out to play guitar perhaps' is the wordplay.
'run out' becomes 'RO' (cricket abbreviation).
'to play guitar perhaps' becomes 'strum' (I can't explain this - if you can you should give a lot more credence to this answer).
'ro'+'strum'='ROSTRUM'
Can you help me to learn more?
(Other definitions for rostrum that I've seen before include "Raised platform" , "Conductor's dais" , "At which one may conduct" , "Podium" , "place for speaker" .)