Dances in films (5)
I believe the answer is:
reels
This clue is a double definition.
'dances' is the first definition.
(reel is a kind of dance)
'films' is the second definition.
(I know this)
'in' acts as a link.
(Other definitions for reels that I've seen before include "Spools" , "Cylinders on which cords are wound" , "Old film parts" , "Rolls of film and dances" , "performed by dancers" .)