Crossword Genius

Did this keep Darcy on her toes? (6)

Ross

I believe the answer is:

ballet

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'did this keep darcy on her toes?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

This is the entire clue.

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(Other definitions for ballet that I've seen before include "The theatre of dance" , "The Nutcracker or Giselle, say" , "old madrigal" , "Let lab open up for dance" , "Theatrical dance" .)

I've seen this clue in The Sun.
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