Container not motoring group’s to return (6)
I believe the answer is:
carton
'container' is the definition.
(carton is a kind of container)
'not motoring group's to return' is the wordplay.
'motoring group' becomes 'RAC' (originally the Royal Automobile Club).
'to return' says the letters should be written in reverse.
'not'+'rac'='notrac'
'notrac' reversed gives 'CARTON'.
(Other definitions for carton that I've seen before include "He did a far, far better thing" , "A cardboard container as for milk" , "Flapped cardboard box" , "Small, light box or container" , "Sydney -, Tale of Two Cities hero" .)