Occupancy is true, wandering around space (6)
I believe the answer is:
tenure
'occupancy' is the definition.
(I've seen this before)
'true wandering around space' is the wordplay.
'wandering' is an anagram indicator.
'around' is an insertion indicator.
'space' becomes 'en' (in printing, a space as wide as a letter 'n').
'true' is an anagram of 'ture'.
'ture' enclosing 'en' is 'TENURE'.
'is' is the link.
(Other definitions for tenure that I've seen before include "Possession of office or property" , "Right to keep job" , "Incumbency" , "Tenancy" , "Residence" .)