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Backing international's appeal (7)

Ross

I believe the answer is:

protest

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'appeal' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

'backing international's' is the wordplay.
'backing' becomes 'pro' (being pro something is backing or supporting it).
'international' becomes 'test' (as in a test match in cricket).
'pro'+'test'='PROTEST'

Can you help me to learn more?

(Other definitions for protest that I've seen before include "Public demonstration" , "Spotter of objection" , "Objection from potters" , "Showing support" , "Object loudly" .)

I've seen this clue in The Telegraph.
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