Crossword Genius

Dance new at using segue (6)

Ross

I believe the answer is:

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'dance' is the definition.
(thesaurus)

'new at using segue' is the wordplay.
'WATUSI' is hidden in amongst the letters.
But, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

I've seen this clue in Sydney Morning Herald.