Dance round object, extremely elegant (6)
I believe the answer is:
ballet
'dance' is the definition.
(I know that ballet is a type of dance)
'round object extremely elegant' is the wordplay.
'round object' becomes 'ball' (I've seen this before).
'extremely' means to remove the middle letters (only the extremes of the word are used).
'elegant' with its centre taken out is 'et'.
'ball'+'et'='BALLET'
(Other definitions for ballet that I've seen before include "Classical dance form" , "Dance art form" , "Let lab open up for dance" , "The theatre of dance" , "kind of skirt" .)