Rug style, or a dance (4)
I believe the answer is:
shag
I believe this clue is a double definition.
'rug style' is the first definition.
(I've seen this in another clue)
'a dance' is the second definition.
(I know that shag is a more specific form of the action dance)
(Other definitions for shag that I've seen before include "Kind of cormorant - tobacco" , "Bird - dance" , "Coarse tobacco - cormorant" , "flighty creature" , "Diver" .)