Crossword Genius

Improvised cigar stuffed with pound of old vegetable (6)

Ross

I believe the answer is:

garlic

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'vegetable' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for garlic that I've seen before include "Pungent bulbs" , "Food flavouring not favoured by vampires?" , "Aromatic bulb used as seasoning" , "Pungent cooking ingredient" , "Kitchen additive" .)

I've seen this clue in The Independent.
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