### Clue: Troop keeps absorbent material for gun (9)
### Answer: FLINTLOCK 
 ### Explanation: Definition: gun
  FLOCK(a collective noun for a group of animals, including humans,troop,band) **containing**(keeps) LINT(absorbent material used in eg. dressing wounds, derived in name and made from linen)
Defn:  An old fashioned gun named after the firing mechanism