Possible Clues:

• Difficult to catch, hard to pin down
• Difficult to catch, find
• Hard to catch vile Sue wriggling
• Transient
• Slippery European capable of shocking, taking us in
• Eel swimming round us I figure will be hard to catch
• Dodgy individual giving ninety the sack
• Hard to find or pin down
• Broadcast live, Sue is difficult to understand
• Hard to catch European appearing in person across America