Man organised a file (5)
I believe the answer is:
alfie
'man' is the definition.
'organised a file' is the wordplay.
'organised' is an anagram indicator.
'a'+'file'='afile'
'afile' is an anagram of 'ALFIE'.
(Other definitions for alfie that I've seen before include "well-known film" , "Michael Caine role reprised by Jude Law" , "Name of fellow" , "1966 Michael Caine film" , "Early Michael Caine film" .)