Crossword Genius

Vegetable has one on both sides (5)

Ross

I believe the answer is:

onion

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'vegetable' is the definition.
(onion is a vegetable)

'one on both sides' is the wordplay.
'both sides' becomes 'ion' (I can't explain this - if you can you should give a lot more credence to this answer).
'on'+'ion'='ONION'

'has' is the link.

Can you help me to learn more?

(Other definitions for onion that I've seen before include "Shape of Russian dome" , "One may be set" , "Pungent vegetable" , "Edible tear-jerker" , "Bulb used as a vegetable" .)

I've seen this clue in The Guardian and The Globe and Mail.
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