Noisiness drowns out legendary Irishman (5)

I believe the answer is:

oisin

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'legendary irishman' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'noisiness drowns out' is the wordplay.
'out' says the answer is hidden in the clue (I've seen 'out of' mean this).
'OISIN' can be found hidden inside 'noisiness drowns'.

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I've seen this clue in The Irish Times.

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