Related Clues:

• The third O of OOO
• Bathtime tester
• The third of three X's
• Gout target, often
• It's out on a limb
• One of a rhino's 12
• Part of a sock
• Water temperature gauge, sometimes
• AKA Hector (Blake)
• Certain limb's end
• Stubbed thing
• Tub temperature tester
• Water-temperature gauge
• Stubbing victim
• Kicker's digit?