Crossword Genius

Raincoats reportedly greatest value (3)

Ross

I believe the answer is:

max

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'value' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for max that I've seen is " The greatest".)

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