Dance in drag, delaying end of rumba (4)
I believe the answer is:
hula
'dance' is the definition.
(I know that Hula is a type of dance)
I don't understand the remainder of the clue.
(Other definitions for hula that I've seen before include "Hip-swaying dance of Hawaii" , "Hoop spun around the body" , "Hawaiian dance - kind of hoop" , "Hawaiian rain dance" .)