Related Clues:

• Evasive like an eel
• Difficult to get hold of drug, see?
• Mule you've initially found difficult to get hold of
• Wanting to throw Conservative into panic
• Difficult to hold
• Elusive Iberian leaders snarled up outside
• Wet, slimy; evasive
• Untrustworthy, like a mule?
• Like a slippery catch, hard for the blessed fellow to miss!
• Alarm about diamonds, say, becoming rare
• Adjective for 51-Across
• Rare shock, leader in competition getting held
• Relating to long fish
• Rare fright, catching cold
• Panic about the copperhead is rare