### Clue: Disheartened when fighter aircraft with corrosion gets admired (10)
### Answer: FRUSTRATED 
 ### Explanation: Definition: Disheartened
  F(military designation for fighter aircraft) **plus**(with) RUST(what's left after corrosion) **plus**(gets) RATED(implicitly highly rated,admired)
Defn:  You would be disheartened if someone/something frustrated you.