Swims for the films (5)

I believe the answer is:

reels

I'm a little stuck... Click here to teach me more about this clue!

'the films' is the definition.
(reel is a kind of film)

I don't understand how the remainder of the clue works.

(Other definitions for reels that I've seen before include "performed by dancers" , "Scottish dances" , "Highland dances" , "Staggers about in lively dances" , "Cylinders on which cords are wound" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app