Occupation of space in true style (6)
I believe the answer is:
tenure
'occupation' is the definition.
(I've seen this before)
'space in true style' is the wordplay.
'space' becomes 'en' (in printing, a space as wide as a letter 'n').
'in' indicates putting letters inside.
'style' indicates anagramming the letters (style can mean to shape or design).
'true' with letters rearranged gives 'ture'.
'en' inserted inside 'ture' is 'TENURE'.
'of' is the link.
(Other definitions for tenure that I've seen before include "Possession of office or property" , "Period of occupation" , "Neuter (anag)" , "The holding of land or property" , "Dairy product" .)