Possible Clues:

• Justify one extra being scrambled before end of game
• Free of duty, excluding levy on single person
• Clear river infested with single type of vermin
• You can't blame it for being formerly at a single speed
• Pardon it's being such a former, single speed
• Declare to be free from blame
• No longer a single charge. Is that clear?
• Clear estimate follows former one
• You can't blame this for being such a former, single speed
• No longer single speed, that's clear