British trains losing time in seaside places (7)

I believe the answer is:

beaches

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

But I can't explain it at all! Could you help me understand?

(Other definitions for beaches that I've seen before include "Areas of sand going down to the water" , "Sandy shores" , "Sandy areas" .)

I've seen this clue in The Telegraph.

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.