... shoddy, unroofed pile (4)
I believe the answer is:
heap
'pile' is the definition.
('heap' can be a synonym of 'pile')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for heap that I've seen before include "Mound, stack" , "good deal" , "Amass" , "Pile, stack" , "Wreck of a car" .)