Possible Clues:

• Subway synonymous with Greek city - the state capital perhaps
• Sole import produced in New York, say
• Superman's city
• Very large city
• Import sole gone off from the city
• Experienced soldiers sent back to most of European city
• More spoilt reels for early film
• Montreal, familiarly
• More plots I develop in population centre
• Implores to move to London, say