Rummage for right sort of file (5)
I believe the answer is:
rifle
'rummage' is the definition.
(I've seen this in another clue)
'for right sort of file' is the wordplay.
'right' indicates one should take the final letters (the letter on the right of the word).
'sort of' indicates anagramming the letters.
The final letter of 'for' is 'r'.
'file' is an anagram of 'ifle'.
'r'+'ifle'='RIFLE'
(Other definitions for rifle that I've seen before include "Gun; plunder" , "Flier (anag.)" , "Gun - ransack" , "Author of report" , "Weapon - sack" .)