Catchy song (3)

I think it could be either:

Which length description are you looking for?:

bop

'catchy song' is the definition.
(I've seen this in another clue)

This is the entire 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" .)

I've seen this clue in the LA Times, the Universal and the USA Today.

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