Related Clues:

• One may end with "or else!"
• Danger the art is fake
• Hard coming in to deal with possibility of trouble
• Tense intensity containing end of nuclear menace
• Climate change, notably
• Hatter (anag.)
• Running around, the rat is a danger
• Warning from Mad Hatter
• Moving right up the rat menace
• Mad Hatter's a menace
• Forging - the art is a risk
• Menace to hare running in race
• Word after 'triple' or 'empty'
• 'If you don't tell them, I will,' e.g
• Ominously, it appears the singer's suffering upset stomach