### Clue: Move swiftly, and perhaps pound boxer (9)
### Answer: FLYWEIGHT 
 ### Explanation: Definition: boxer
 FLY(to move swiftly) **plus**(and) WEIGHT(a unit of which could be;is perhaps, the pound, equal to 16 ounces, in the avoirdupois system).
Defn: … who does not weigh more than 112 pounds.