Catchy song (3)
I believe the answer is:
bop
'catchy song' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bop that I've seen before include "Dance of the 1950s" , "Dance - hit (informal)" , "Lively dance" , "Form of jazz from the 1940s" , "Dance to pop music" .)