Possible Clues:

• A lust for the Oklahoma oil city?
• On chart it was a day away for a low woman heading north
• A tart picked up in US city
• City for 34-Down, perhaps
• Oklahoma river port
• City girl who's poorly turned out to have retracted blood type
• A woman of the night looking up a port in Oklahoma
• Major oil centre close to vast lake in America
• Time line dividing America's Oklahoma City
• An OK place like Luton doesn't need working over