Paving stone — mend shoes (6)
I believe the answer is:
cobble
I believe this clue is a double definition.
'paving stone' is the first definition.
(cobble is a kind of paving stone)
'mend shoes' is the second definition.
(I've seen this in another clue)
(Other definitions for cobble that I've seen before include "Work on last" , "Mend or make shoes and boots" , "Stone used in road surfaces" , "What a shoe repairer does" , "Road-surfacing stone" .)