Crossword Genius

Spectator's informal greeting overheard (7)

Ross

I believe the answer is:

watcher

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'spectator's' is the definition.
(thesaurus)

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(Other definitions for watcher that I've seen before include "Big Brother?" , "Alert observer" , "I observe" , "One who observes" , "Onlooker" .)

I've seen this clue in The Independent.
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