Reveal there's been a fight outside the ring (5,3)
I believe the answer is:
bring out
'reveal' is the definition.
(synonyms)
'fight outside the ring' is the wordplay.
'fight' becomes 'bout' (as in a bout in boxing).
'outside' indicates putting letters inside.
'bout' going around 'ring' is 'BRING OUT'.
'there's been a' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for bring out that I've seen before include "Publish" , "Issue" , "Emphasise" , "Elicit" , "Emphasize (a feature)" .)