Revolutionary feature of non-motorised transport (9)
I believe the answer is:
cartwheel
'revolutionary feature' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'non-motorised transport' is the wordplay.
'non-motorised' becomes 'cart' (I can't justify this - if you can you should believe this answer much more).
'transport' becomes 'wheel' (wheel is a kind of transport).
'cart'+'wheel'='CARTWHEEL'
'of' is the link.
Can you help me to learn more?
(Other definitions for cartwheel that I've seen before include "one that's on the wagon" , "holding up farm vehicle?" , "Wainwright creates this" , "Gymnastic feat" , "Revolutionary move" .)