Possible Clues:

• Increase when there's a botched case: dead
• Mount with a castle destroyed by foe ultimately
• Climb ruined castle with ends of axe
• Quickly increase in scale
• Increase in intensity or extent, like trouble brewing
• Cause to increase, say dispute (8).
• The broken case, being no more, will get more so
• Raise case being resolved tardily
• Swell
• Engineer laces tea to get high