Crossword Genius

Veg on gas uncovered (7)

Ross

I believe the answer is:

legumes

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'veg on gas' is the definition.
Although both the answer and definition are plural nouns, I cannot understand how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for legumes that I've seen before include "Peas, beans, and lentils" , "Pulse" , "Plants that bear their seeds in pods" .)

I've seen this clue in The Telegraph.
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