Paris' underground rail system (5)

I believe the answer is:

metro

(Other definitions for metro that I've seen before include "Parisian underground railway" , "Paris underground rail system" , "French underground" , "Parisian underground system" , "what moves many Parisians" .)

I've seen this clue in the Sydney Morning Herald.

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.