### Clue: Buttonhole flower people leaving taxi? (3)
### Answer: CAR 
 ### Explanation: Definition: taxi?
 "carnation"(a flower that you wear in the buttonhole or pinned to the lapel of your coat or dress) **minus**(… leaving) "nation"(a large body of people inhabiting a particular country or territory).
Defn: That which could be/? used as a taxi.