Carriage still in reverse, about to turn (7)
I believe the answer is:
trolley
'carriage' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for trolley that I've seen before include "Supermarket vehicle" , "Basket, truck on wheels" , "tramcar" , "means to transport brew" , "Shopping vehicle" .)