Catchy phrase of pantomime villain (4)
I believe the answer is:
hook
I believe this is a double definition.
'catchy phrase' is the first definition.
(catchy phrase in a song)
'pantomime villain' is the second definition.
(Captain Hook from Peter Pan)
'of' acts as a link.
(Other definitions for hook that I've seen before include "Spit of land" , "Barb" , "Attacking cricket stroke" , "Peg for hanging" , "Eyecatching" .)