Greens on cycling: 'That hurts!' (4)

I believe the answer is:

chou

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'greens on cycling that hurts' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

This is all the clue.

Can you help me to learn more?

(Other definitions for chou that I've seen before include "Cabbage-shaped pastry" , "Cabbage - Chinese imperial dynasty" , "Cabbage - ornamental rosette - cream bun" , "Pet" .)

I've seen this clue in The Guardian.

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