Calling on, for the next bout (6,5)
I believe the answer is:
coming round
'calling' is the definition.
(I've seen this before)
'for the next bout' is the wordplay.
'for' becomes 'coming' (I can't justify this - if you can you should give a lot more credence to this answer).
'the next' is a charade indicator (letters next to each other) (I've seen this in other clues).
'bout' becomes 'round' (synonyms).
'coming'+'round'='COMING ROUND'
'on' is the link.
Can you help me to learn more?
(Another definition for coming round that I've seen is " Calling".)