Crossword Genius

Fighters for a cause, chums suppressing a noise (8)

Ross

I believe the answer is:

paladins

'fighters for a cause' is the definition.
(the knights of Charlemagne were paladins)

'chums suppressing a noise' is the wordplay.
'chums' becomes 'pals' ('pal' can be a synonym of 'chum').
'suppressing' means one lot of letters goes inside another.
'noise' becomes 'din' (din is a kind of noise).
'a'+'din'='adin'
'pals' going around 'adin' is 'PALADINS'.

(Another definition for paladins that I've seen is " Heroic knights".)

I've seen this clue in The Telegraph.
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