It's behind the evacuation of Amiens, Toulouse and Rouen (6)

I believe the answer is:

astern

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

'it's behind' is the definition.
(at the back or behind of a ship)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for astern that I've seen before include "following behind vessel" , "Behind the back of a ship" , "Towards the back (of a ship)" , "Behind (a boat)" , "Rearward" .)

I've seen this clue in The Guardian.

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.