Crossword Genius

Surrealist artist in the morning performs volte-face (4)

Ross

I believe the answer is:

maar

I'm a little stuck... Click here to teach me more about this clue!

'surrealist' is the definition.
Both the definition and answer 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?

(Another definition for maar that I've seen is " crater".)

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