Related Clues:

• Hard to catch, in a way
• Too slippery and slimy to grasp
• Lampreylike
• Long and slimy
• Long, wet, and snakelike
• Wriggly and slimy
• It's slippery, see — that's what we hear
• Moray-like
• Hard to capture
• Slippery and hard to catch
• Like an eel
• Evasive like an eel
• Difficult to get hold of drug, see?
• Mule you've initially found difficult to get hold of
• Difficult to hold