### Clue: Mull as setting for wild roo? That's funny (8)
### Answer: HUMOROUS 
 ### Explanation: Definition: funny
**HUMUS** ("mull") *as setting for* ***(roo)** 
*According to Chambers, "mull" is a layer of humus, formed by rapid decomposition throught he actions of a rich soil fauna in near-neutral or alkaline conditions.