Possible Clues:

• Where rodent settled in river embankment
• Port mother found underneath compost heap?
• Foreign city bank headed by a rascal
• Mother supporting scoundrel in European city
• Where to watch Feyenoord at home
• Rat that's rabid turning up in city abroad
• Feyenoord home
• He's no good to his mother in the 9 across 20 down
• River taking Tarka, say, over barrier to port
• One of the world's largest ports