Possible Clues:

• Would it rise after the cart for firing?
• British leaving to make way across watershed ...
• Crest of a game bird having part missing
• German during journey reached hilltop
• Evidence of high pressure produces the hump
• The cart before the rise may make it go off
• Wrinkle free and middle-aged!
• If a cart gets over this it may go off
• Hump - saddle
• Nose part