Cheat needing form of therapy — one is devoid of feelings (5)
I believe the answer is:
robot
'one is devoid of feelings' is the definition.
'cheat needing form of therapy' is the wordplay.
'cheat' becomes 'rob' (robbing is a kind of cheating).
'needing' is a charade indicator (letters next to each other).
'form of therapy' becomes 'ot' (occupational therapy).
'rob'+'ot'='ROBOT'
(Other definitions for robot that I've seen before include "Computer-controlled machine" , "Mechanical man" , "Programmable machine" , "Unpaid worker" , "Mechanism that moves automatically" .)