Go on turning employer against me (6)
I believe the answer is:
resume
'go on' is the definition.
(resuming is a kind of going on)
'turning employer against me' is the wordplay.
'turning' shows that the letters should be reversed in order.
'employer' becomes 'user' (someone who employs or uses something).
'against' says to put letters next to each other.
'user' back-to-front is 'resu'.
'resu'+'me'='RESUME'
(Other definitions for resume that I've seen before include "proceed" , "CV (US)" , "Begin where you left off" , "Continue after a break" , "Pick up again" .)