Worn-down part of a shoe (4)
I believe the answer is:
sole
(Other definitions for sole that I've seen before include "A lone sort of fish - lose it" , "Bottom of the foot" , "swimmer" , "Unique" , "Shoe part -- lone" .)
I believe the answer is:
sole
(Other definitions for sole that I've seen before include "A lone sort of fish - lose it" , "Bottom of the foot" , "swimmer" , "Unique" , "Shoe part -- lone" .)