Overturned cart in enclosed ground (4)
I believe the answer is:
yard
'enclosed ground' is the definition.
(enclosed outside area)
'overturned cart' is the wordplay.
'overturned' shows that the letters should be reversed in order.
'cart' becomes 'dray' (a cart without sides for delivering heavy loads).
'dray' written backwards gives 'YARD'.
'in' is the link.
(Other definitions for yard that I've seen before include "Get the measure" , "area behind the house" , "Dray (anag.)" , "short distance" , "Enclosed area; length" .)