Loads of ‘brrm brrm’ when this happens? (7)
I believe the answer is:
cargoes
'loads' is the definition.
('cargo' can be a synonym of 'load')
'brrm brrm when this happens?' is the wordplay.
I cannot quite see how this works, but
'happens?' could be 'goes' (going is a kind of happening) and 'goes' is found within the answer.
The remaining letters 'car' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'of' is the link.
Can you help me to learn more?
(Other definitions for cargoes that I've seen before include "Ships' loads" , "Carried loads" .)