Expose gang involved in fight (5,3)
I believe the answer is:
bring out
'expose' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Maybe you can see a link between them that I can't see?
'gang involved in fight' is the wordplay.
'gang' becomes 'ring' (synonyms).
'involved in' indicates putting letters inside.
'fight' becomes 'bout' (as in a bout in boxing).
'ring' put into 'bout' is 'BRING OUT'.
Can you help me to learn more?
(Other definitions for bring out that I've seen before include "Emphasize (a feature)" , "Elicit" , "Issue" , "Emphasise" , "Unveil" .)