### Clue: Irritable friend of Mole and Toad (5)
### Answer: RATTY 
 ### Explanation: Definition: Irritable,friend of Mole and Toad
  Double defn.  2nd:  One of the characters in The Wind in the Willows, a children's book, featuring 4 main characters:  *Mole*, Mr. *Toad*, Mr. Badger, and Ratty, who is, well, a water rat, *friend*s all.