Shipping route (3,4)

I think it could be either:

Which length description are you looking for?:

3,4

sea lane

'shipping route' is the definition.
(I've seen this before)

This is all the clue.

(Another definition for sea lane that I've seen is " marine passage".)

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.