Crossword Genius

I’m surprised Rothko gets regularly scratched (3)

Ross

I believe the answer is:

oho

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'i'm surprised' is the definition.
(exclamation of surprise)

I don't understand the remainder of the clue.

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(Other definitions for oho that I've seen before include "Triumphant cry" , "I see!" , "Expression of surprise" .)

I've seen this clue in The Times.
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