Occupancy (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
tenure
'occupancy' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tenure that I've seen before include "(Right of) occupancy" , "Right or period to hold, university post say" , "Tenancy" , "Dairy product" , "Retune (anag.)" .)