In protest, I only want meat loaf! (3,3)

I believe the answer is:

veg out

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

'only want meat loaf' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'in protest i' is the wordplay.
I cannot really see how this works, but
'i' could be 'ego' ('I' in Latin) and 'ego' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.

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