Dance on one leg? (3)
I believe the answer is:
hop
I believe this clue is a double definition.
'dance' is the first definition.
(I know that hop is a type of dance)
'one leg?' is the second definition.
'on' is the link.
(Other definitions for hop that I've seen before include "Leap on one leg" , "Jump; dance" , "Dancing party (informal)" , "Climbing plant - jump!" , "Skip; beer flavouring ingredient" .)