Tear up the dance floor (3,4)
I believe the answer is:
get down
'tear up the dance floor' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for get down that I've seen before include "See feathers, > alight" , "Swallow" , "you could - from duck" , "Dismount, alight" .)