Did this keep Darcy on her toes? (6)
I believe the answer is:
ballet
'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.
Can you help me to learn more?
(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" .)