Pals booed dancing a ballroom dance (4,5)
I believe the answer is:
paso doble
'a ballroom dance' is the definition.
(paso doble is a kind of ballroom dance)
'pals booed dancing' is the wordplay.
'dancing' indicates an anagram.
'pals'+'booed'='palsbooed'
'palsbooed' with letters rearranged gives 'PASO DOBLE'.
(Other definitions for paso doble that I've seen before include "Latin-American dance" , "Two-step (music)" , "Bullfight music - ape's blood (anag)" , "Steps" , "Fast Latin American ballroom dance" .)