Goods vehicle reversing in confined space (4)
I believe the answer is:
yard
'goods' is the definition.
(yard goods is a kind of goods)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for yard that I've seen before include "A little under a metre" , "Quadrangle" , "Space outside" , "Three feet out the back" , "Quad; a length" .)