A good deal of spectacle (5)
I believe the answer is:
sight
I believe this is a double definition.
'a good deal' is the first definition.
(I know that good deal can be written as sight)
'spectacle' is the second definition.
(spectacle can mean a sight or display)
'of' is the link.
(Other definitions for sight that I've seen before include "Spectacle; aiming aid" , "a great deal" , "good deal" , "Field of vision" , "Spot - eyesore" .)