Sound sense of position (4)
I believe the answer is:
site
'position' is the definition.
(I know that site is a type of position)
'sound sense' is the wordplay.
'sound' indicates a 'sounds like' (homophone) clue.
'sense' becomes 'sight' (sight or vision is a sense).
'sight' is a homophone of 'SITE'.
'of' acts as a link.
(Other definitions for site that I've seen before include "Location or piece of land" , "setting" , "Locale" , "Somewhere to build, perhaps" , "Place for building" .)