Plant with greenish-white flowers cultivated for its edible rounded bulb (5)

I believe the answer is:

onion

(Other definitions for onion that I've seen before include "Type of allium" , "associated with 26 [TRIPE] ?" , "Shape of Russian dome" , "Cause of tears" , "Head (slang); vegetable" .)

I've seen this clue in The Mirror.

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