Related Clues:

• Cold enough there for the cockney to turn out to be a hard nut
• When frozen, maybe the cockney turns to a hard nut
• This should enable one to keep a cool head
• The cockney comes back as a hard nut from the 21 across
• Seems hard to get on ahead with this
• This will help you to keep a cool head to a great extent
• The doctor gets frozen with his aunt around
• That'll give one a cold in the head
• Ere's an 'ard nut to try to live there
• One hundred pick up the pace for a cool Mass!
• North Pole topper
• I see in a text a step back from global warming interest
• The opposite of a sun bonnet?
• 'Eavy up in the far north
• It might help to keep a cool head?