Crossword Genius

Expert historian (10)

Ross

I believe the answer is:

pastmaster

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'expert' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for pastmaster that I've seen before include "Expert" , "Old hand" .)

I've seen this clue in The Irish Times.
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