Crossword Genius

Person with assured belief Arkwright heard? (6)

Ross

I believe the answer is:

knower

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'person' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for knower that I've seen is " One who's acquainted".)

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