I get a raven trained so it's not eating worms (10)

I believe the answer is:

vegetarian

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'it's not eating worms' is the definition.
I can't judge whether this defines the answer.

'i get a raven trained' is the wordplay.
'trained' is an anagram indicator (train can mean to shape or manipulate).
'i'+'get'+'a'+'raven'='igetaraven'
'igetaraven' anagrammed gives 'VEGETARIAN'.

'so' acts as a link.

Can you help me to learn more?

(Other definitions for vegetarian that I've seen before include "Herbivorous person" , "Non-meat-eater" .)

I've seen this clue in the Evening Standard.

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