Crossword Genius

Underground system (5)

Ross

I believe the answer is:

metro

'underground system' is the definition.
(I've seen this before)

This is the entire clue.

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

I've seen this clue in The Guardian.
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