Cart in enclosed area turned around (4)
I believe the answer is:
dray
'cart' is the definition.
(a cart without sides for delivering heavy loads)
'enclosed area turned around' is the wordplay.
'enclosed area' becomes 'yard' (I've seen this before).
'turned around' shows that the letters should be reversed in order.
'yard' back-to-front is 'DRAY'.
'in' is the link.
(Other definitions for dray that I've seen before include "Flat-bed truck" , "Low truck" , "Cart to carry heavy loads" , "Brewery wagon" , "Brewer's horse-drawn cart" .)