Crossword Genius

Kind of dome on the allotment? (5)

Ross

I believe the answer is:

onion

I'm a little stuck... Click here to teach me more about this clue!

'kind of dome' is the definition.
(I've seen this in another clue)

'on the allotment?' is the wordplay.
'the allotment?' becomes 'ion' (I can't explain this - if you can you should believe this answer much more).
'on'+'ion'='ONION'

Can you help me to learn more?

(Other definitions for onion that I've seen before include "Shape of Russian dome" , "reason for tears" , "Hot dog topping" , "Head (slang); vegetable" , "Strong tasting vegetable" .)

I've seen this clue in the Evening Standard.
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