### Clue: Rubbish heaps left out in street that's extremely messy (10)
### Answer: SCRAPPIEST 
 ### Explanation: Rubbish heaps left out in street that's extremely messy (10)
**CRAP** ("rubbish") + **PI**(l)**ES** ("heaps" with L (left) *out*) *in* **St**. (street)