Crossing Doubtful Sound, maybe, Juliet's blown away (4)
I believe the answer is:
ford
'crossing' is the definition.
(synonyms)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ford that I've seen before include "Shallow area in a stream where it can be crossed" , "Shallow place for river crossing" , "River or stream crossing" , "White paint for the face" , "Ex-president" .)