Ledge revealing rotten flesh (5)
I believe the answer is:
shelf
'ledge' is the definition.
(I know that ledge can be written as shelf)
'rotten flesh' is the wordplay.
'rotten' indicates anagramming the letters.
'flesh' anagrammed gives 'SHELF'.
'revealing' is the link.
(Other definitions for shelf that I've seen before include "Works are held up by it" , "support for books?" , "Horizontal surface for holding objects" , "Ledge for books etc" , "Horizontal surface to put things on" .)