Location of vision, we hear (4)
I believe the answer is:
site
'location' is the definition.
(I know that site is a type of place)
'vision we hear' is the wordplay.
'vision' becomes 'sight' (synonyms).
'we hear' indicates a 'sounds like' (homophone) clue.
'sight' is a homophone of 'SITE'.
'of' is the link.
(Other definitions for site that I've seen before include "Position; situation" , "Somewhere to build, perhaps" , "Location or piece of land" , "Whereabouts" , "Area set aside for building" .)