Title of Sir Trevor not used in full (2,3)

I believe the answer is:

rt rev

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'in full' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'title of sir trevor not' is the wordplay.
'RT REV' is hidden within the letters.
But, I'm not sure how this is indicated.

'used' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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