Demonstration in favour of international match (7)
I believe the answer is:
protest
'demonstration' is the definition.
(I have seen 'Public demonstration ' mean 'protest' so perhaps 'demonstration' could also mean 'protest')
'in favour of international match' is the wordplay.
'in favour of' becomes 'pro' (being pro a particular cause).
'international match' becomes 'test' (I've seen this before).
'pro'+'test'='PROTEST'
(Other definitions for protest that I've seen before include "State objection" , "Express opposition" , "Object loudly" , "Complaint" , "Object strenuously" .)