Reportedly mention venue (4)
I believe the answer is:
site
'venue' is the definition.
(I've seen this in another clue)
'reportedly mention' is the wordplay.
'reportedly' shows a homophone (sound like).
'mention' becomes 'cite' (to cite is to mention or quote).
'cite' is a homophone of 'SITE'.
(Other definitions for site that I've seen before include "Whereabouts" , "Locale" , "Position for the building sounds visual" , "Locate, position" , "Ties into building location" .)