Possible Clues:

• Cheat at checkout ... and a hint to the circled letters
• Cheat someone by not returning enough money
• Do brief amendment
• Cheat at the register
• Give poor value to
• To defraud customers makes little difference
• Unfairly treat anti-war backbencher, to be put to death in church
• Give back less than the correct amount
• Dish out the wrong cash (with bit missing)
• Give insufficient recompense