Spoke of black salad vegetable (5)

I believe the answer is:

chard

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This might be a double definition.

'spoke of black salad' is the first definition.
'chard' can be an answer for 'salad' (I've seen this before). I'm not certain of the 'spoke of black' bit.

'vegetable' is the second definition.
(I know that chard is a type of Leaf vegetable)

Can you help me to learn more?

(Other definitions for chard that I've seen before include "Green vegetable" , "Variety of beet with edible white leaf stalks" , "vegetable crop" , "Vegetable; Somerset town" , "Leafy green" .)

I've seen this clue in the Sydney Morning Herald.

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