Celebrate noisily (7)

I think it could be either:

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5,2,2

roister

'celebrate noisily' is the definition.
(roistering is a kind of celebrating noisily)

This is the entire clue.

(Other definitions for roister that I've seen before include "Be boisterous" , "Revel noisily, swagger" , "I rest or (anag) - engage in noisy merrymaking" , "Celebrate noisily" , "Carouse" .)

I've seen this clue in The Times and the Sydney Morning Herald.

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