Files with revised leader as afterthought (5)
I believe the answer is:
rasps
'files' is the definition.
(I know this)
'revised leader as afterthought' is the wordplay.
'leader' says to take the initial letters.
'afterthought' becomes 'ps' (ps stands for postscript).
The first letter of 'revised' is 'r'.
'r'+'as'+'ps'='RASPS'
'with' is the link.
(Other definitions for rasps that I've seen before include "Grates harshly" , "Jars" , "fruit briefly" , "Scrapes" , "speaks hoarsely" .)