Extremely supportive of dance breakthrough? (9)

I believe the answer is:
discovery
This clue could be a double definition.
'extremely supportive of dance' is the first definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'breakthrough?' is the second definition.
('discovery' can be a synonym of 'breakthrough')
Can you help me to learn more?
(Other definitions for discovery that I've seen before include "Space shuttle which launched the Hubble telescope" , "Process of finding" , "Detection, unearthing" , "Thing found (or the finding)" , "Pacific explorer" .)
