Beholder (8)
I believe the answer is:
observer
'beholder' is the definition.
(I know that beholder can be written as observer)
This is all the clue.
(Other definitions for observer that I've seen before include "Newspaper - witness" , "Spectator - or another weekly publication!" , "One watching, evaluating" , "Viewer" , "'Onlooker, spectator (8)'" .)