### Clue: Volume of copper piece holding constant charge (5,4)
### Answer: CUBIC FEET 
 ### Explanation: Definition: Volume
  [CU(chemical symbol for the element, copper)] + BIT(a piece) **containing**(holding) [C(mathematical symbol for a constant number) + FEE(a charge for a service rendered)].
Answer:  Pre-metrication, a measure of volume in the Imperial system.