Onlookers (10)

I think it could be either:

spectators

bystanders

'onlookers' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for bystanders that I've seen before include "Those happening to be present" , "Onlookers" , "Spectators" , "Observers" .)

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

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