Crossword Genius

They treat each other very fairly (5)

Ross

I believe the answer is:

dutch

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'they treat' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for dutch that I've seen before include "Sort of courage" , "go fifty-fifty" , "partner" , "Better half" , "A European; pay-for-oneself (treat)" .)

I've seen this clue in the Evening Standard.
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