Crossing the channel (7)
I believe the answer is:
passage
I believe this is a double definition.
'crossing' is the first definition.
(act of crossing or travelling through)
'the channel' is the second definition.
(I've seen this before)
(Other definitions for passage that I've seen before include "equestrian manoeuvre" , "Short section of text" , "Piece of text or music" , "Alley - corridor" , "Section of musical or literary work" .)