### Clue: Corporal, say, with little brother on an unbroken horse (6)
### Answer: BRONCO 
 ### Explanation: Definition: an unbroken horse
 NCO(abbrev. for "non-commissioned officer", an example/say, of which is a corporal in the army) **placed below**(with … on, in a down clue) BRO(short/little for "brother").
Defn: An wild or half-tamed/unbroken horse of the western US.