Where it's at (5)
'where it's at' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for venue that I've seen before include "Location of meeting" , "Place for organised event" , "locale" , "Site for event" , "The place where something happens" .)
(Other definitions for location that I've seen before include "Position or situation" , "Place, site" , "Whereabouts, position" , "Position,place" , "Place, position" .)