Dance film (4)
I believe the answer is:
I believe this clue is a double definition.
'dance' is the first definition.
(reel is a kind of dance)
'film' is the second definition.
(I know that reel is a type of film)
(Other definitions for reel that I've seen before include "Dance; winding cylinder" , "Lively Scottish dance" , "Stagger in Irish dance" , "Totter" , "unwind?" .)