Possible Clues:

• Way to go, in Paris
• The first 'M' in M-G-M
• Washington transit system, with 'the'
• What goes through Porte Maillot in northerly direction?
• Way to commute
• All Zazie wanted to see, sadly closed by strike
• Transport system provided by some trolleybuses
• Film studio, for short
• Citified, for short
• Form of transport, note, linked with city of Paris mainly