Reversing brewery vehicle in quadrangle (4)
I believe the answer is:
yard
'quadrangle' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for yard that I've seen before include "Three feet - enclosed area" , "area behind the house" , "Quad; a length" , "Measure - enclosed paved area" , "3ft" .)