Spectator, onlooker (8)
I believe the answer is:
observer
This clue is a double definition.
'spectator' is the first definition.
(I've seen this before)
'onlooker' is the second definition.
(I've seen this before)
(Other definitions for observer that I've seen before include "broadsheet" , "I notice" , "One watching, evaluating" , "organ on Sunday" , "Looker-on" .)