Witness (4,2)
'witness' is the definition.
(synonyms)
This is all the clue.
(Other definitions for spectator that I've seen before include "Looker-on" , "one's seen on the terraces?" , "Periodical" , "Eyewitness, viewer" , "I attend sporting event" .)
'witness' is the definition.
(bystander is a kind of witness)
This is all the clue.
(Other definitions for bystander that I've seen before include "Watcher of occurrence" , "Non-participant spectator" , "Bad sentry may be an onlooker" , "Non-partcipating spectator" , "Onlooker (often innocent)" .)
'witness' is the definition.
(synonyms)
This is all the clue.
(Other definitions for see that I've seen before include "Watch, equal (a bet)" , "judge" , "Bishops office" , "Receive" , "Observe the papacy in Rome" .)
'witness' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for observe that I've seen before include "Obverse (anag.)" , "Look at" , "Watch without intervening" , "Watch carefully" , "Notice; study" .)
'witness' is the definition.
(looker-on is a kind of witness)
This is all the clue.
(Another definition for looker-on that I've seen is " A (mere) spectator".)
'witness' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for beholder that I've seen before include "Onlooker" , "One who observes" , "Observer" , "Beauty is said to be in this eye" , "Some looker" .)
'witness' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for look on that I've seen before include "Watch without getting involved" , "Be a spectator, watch" , "Watch without becoming involved" , "Stand by watching, observe" , "Be a spectator, observe" .)
'witness' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for watch that I've seen before include "Look at attentively" , "View" , "Observe - timepiece" , "Keep under observation" , "Keep an eye on - timepiece" .)