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Appraiser of work, awfully nice tat, welcomed by writer (13)

Ross

I believe the answer is:

authenticator

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'appraiser' is the definition.
(I know that appraiser can be written as authenticator)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for authenticator that I've seen is " I can tell what's genuine".)

I've seen this clue in The Guardian.
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