Some conveyancer testified truly of old (6)

I believe the answer is:

certes

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'some conveyancer testified truly of old' is the definition.
I can't judge whether this defines the answer.

'some conveyancer testified truly' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'CERTES' is hidden in the letters of 'conveyancer testified truly'.

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I've seen this clue in The Times.

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