Canteen in one area in Stoke to the west (5)
I believe the answer is:
naafi
'canteen' is the definition.
(Navy, Army and Air Force Institutes run canteens)
'one area in stoke to the west' is the wordplay.
'one' becomes 'i' (Roman numeral).
'area' becomes 'a' (maths abbreviation).
'in' indicates putting letters inside.
'stoke' becomes 'fan' (as in stoking or fanning a fire).
'to the west' says the letters should be written backwards (letters written right to left or 'east to west').
'a' going within 'fan' is 'faan'.
'i'+'faan'='ifaan'
'ifaan' reversed gives 'NAAFI'.
'in' is the link.
(Other definitions for naafi that I've seen before include "Army canteen/shop" , "military institution" , "place for force-feeding?" , "Military facility" , "Forces 17" .)