Soon, I only consumed this vegetable (5)

I believe the answer is:

onion

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

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

'soon i only consumed' is the wordplay.
'ONION' is hidden within the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for onion that I've seen before include "Edible tear-jerker" , "Tear-jerking bulb" , "Bulbous vegetable" , "veggie" , "Bulb used in cooking" .)

I've seen this clue in the Sydney Morning Herald.

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