### Clue: The last person on earth to admit to his failings? (4,5)
### Answer: ONLY HUMAN 
 ### Explanation: Definition: The last person on earth,to admit to his failings
  Double cryptic defn:  1st:  Noun:  The sole earthling left after everyone else has been destroyed; and 2nd:  Adjectival:  Merely mortal, willing to admit his failings, as in "To err is human…"