Hot roofing goop (3)

I believe the answer is:
tar
(Other definitions for tar that I've seen before include "Dark flammable liquid" , "Jack < to blacken" , "Product of burning tobacco" , "'Thick, dark, sticky liquid (3)'" , "Hearty" .)
I believe the answer is:
tar
(Other definitions for tar that I've seen before include "Dark flammable liquid" , "Jack < to blacken" , "Product of burning tobacco" , "'Thick, dark, sticky liquid (3)'" , "Hearty" .)