Crossword Genius

Underground system (5)

Ross

I believe the answer is:

metro

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">underground system</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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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