Some stock a leading green-leafed vegetable (4)

I believe the answer is:

kale

I'm a little stuck... Click here to teach me more about this clue!

'leafed vegetable' is the definition.
'kale' can be an answer for 'vegetable' (kale is a kind of vegetable). I am unsure of the 'leafed' bit.

'some stock a leading green' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'KALE' can be found hidden inside 'stock a leading green'.

Can you help me to learn more?

(Other definitions for kale that I've seen before include "Hardy cabbage" , "Type of cabbage" , "(Curly?) cabbage" , "Cabbage variety" , "Crinkle-leaf cabbage" .)

I've seen this clue in The Guardian.

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