Sole supporter? (5)
I believe the answer is:
cleat
'sole supporter?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cleat that I've seen before include "Device on which to secure a rope" , "Projection for a rope on board" , "Strip used to strengthen a surface to which it is attached" , "One to fasten rope to" , "Projection to tie a rope around" .)