### Clue: It's best not to shoot one in colour before daybreak (3,5)
### Answer: RED LIGHT 
 ### Explanation: Definition: It's best not to shoot one
 RED(a colour) **placed before**(before) LIGHT(daybreak).
Answer: Refers to the "one" in the defn.,a traffic light It's best, if not downright dangerous, to shoot,go past at high speed.