Sidewalk stuff (6)
I believe the answer is:
cement
'sidewalk stuff' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cement that I've seen before include "Brick fixer" , "Powder used to make concrete" , "Glue" , "Stick together - substance used by a builder" , "Stuff that binds or bonds" .)