Crossword Genius

Rivers shown by Miro? (4)

Ross

I believe the answer is:

joan

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for joan that I've seen before include "- - Collins, actress" , "Darby and --, -- of Arc" , ". . . . of Arc, French warrior saint" , "- Sutherland, Australian soprano" , "'Saint - - ' (Shaw play)" .)

I've seen this clue in The Sun.
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