One's there but not involved (9)

I believe the answer is:

bystander

(Other definitions for bystander that I've seen before include "Watcher of occurrence" , "Onlooker (often innocent)" , "Non-partcipating spectator" , "Bad sentry may be an onlooker" , "Non-participant spectator" .)

I've seen this clue in The Guardian.

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