Waltz across the Channel? (5)

I believe the answer is:

valse

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

'waltz' is the definition.
('waltz' in French)

I don't understand the remainder of the clue.

(Other definitions for valse that I've seen before include "Dance" , "Steps taken in France" .)

I've seen this clue in the Evening Standard.

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