Crossword Genius

Patriot's song upset supporters (12)

Ross

I believe the answer is:

protagonists

'supporters' is the definition.
('protagonist' can be a synonym of 'supporter')

'patriot's song upset' is the wordplay.
'upset' is an anagram indicator.
'patriots'+'song'='patriotssong'
'patriotssong' with letters rearranged gives 'PROTAGONISTS'.

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