Possible Clues:

• Not a 35 across circle starts with a bit of the circle (6)
• It's never so hot if one starts to go round with a jerk
• Lorry's straddling left side of carriageway where it's icy
• Of the region around the North Pole
• Nervous complaint following car crash in icy conditions
• Cold a bit round before the jerk
• -- Circle
• Lorry crossing cold region up north
• Very cold round here
• Half of it's round this circle