Mention spectacle in report (4)
I believe the answer is:
cite
'mention' is the definition.
(to cite is to mention or quote)
'spectacle in report' is the wordplay.
'spectacle' becomes 'sight' (spectacle can mean a sight or display).
'in report' indicates a 'sounds like' (homophone) clue (ie reportedly, we hear).
'sight' sounds like 'CITE'.
(Other definitions for cite that I've seen before include "for instance" , "Give as an example" , "Quote as evidence" , "Quote as an example or in support" , "Make reference to" .)