Vegetable in cannelloni only (5)

I believe the answer is:

onion

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

'in cannelloni only' is the wordplay.
'in' indicates a hidden word.
'ONION' is hidden within 'cannelloni only'.

(Other definitions for onion that I've seen before include "Cause of tears" , "Edible tear-jerker" , "Shape of Russian dome" , "Bulbous vegetable" , "Bulb used as a vegetable" .)

I've seen this clue in The Sun.

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