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Should a vegetable grower know his well? (6)

Ross

I believe the answer is:

onions

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If this is the answer I cannot explain how the clue works.

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(Other definitions for onions that I've seen before include "Tearful bulbs" , "Pungent bulbs (6)." , "Punguent bulbs" , "Knowing these vegetables, you'd be well up" , "If you knew your vegetables, you'd be well up" .)

I've seen this clue in The Independent.
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