Manipulative sort (4)
I believe the answer is:
user
'manipulative sort' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for user that I've seen before include "Tech support caller?" , "One operating something" , "Drug addict (colloq.)" , "One who exploits, to be sure" , "one has to employ" .)