Delicate scrap of material in folder (7)
I believe the answer is:
fragile
'delicate' is the definition.
(I know that delicate can be written as fragile)
'scrap of material in folder' is the wordplay.
'scrap of material' becomes 'rag' (a piece of fabric).
'in' is an insertion indicator.
'folder' becomes 'file folder' (file folder is a kind of folder).
'rag' going into 'file' is 'FRAGILE'.
(Other definitions for fragile that I've seen before include "Not robust" , "Delicate; easily broken" , "Rag file is easily broken" , "Easily broken or damaged" , "Breakable" .)