File man messed up in anger (7)
I believe the answer is:
inflame
'anger' is the definition.
(I've seen this before)
'file man messed up' is the wordplay.
'messed up' is an anagram indicator.
'file'+'man'='fileman'
'fileman' anagrammed gives 'INFLAME'.
'in' acts as a link.
(Other definitions for inflame that I've seen before include "Provoke; aggravate" , "Exacerbate" , "Provoke to anger" , "Intensify, aggravate" , "Make (a situation) worse" .)