Crossword Genius

Not all you can eat (3)

Ross

I believe the answer is:

veg

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But I can't explain it at all! Could you help me understand?

(Other definitions for veg that I've seen before include ""Meat and two __ "" , "Potatoes and cabbages etc" , "Eg, sprouts, parsnips" , "Food plants" , "Slob?" .)

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