Ethics broken by arm-twisting companion (7)
I believe the answer is:
comrade
'companion' is the definition.
(synonyms)
'ethics broken by arm-twisting' is the wordplay.
'ethics' becomes 'code' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'broken by' is an insertion indicator.
'twisting' says the letters should be written backwards (letters twist back).
'arm' back-to-front is 'mra'.
'code' enclosing 'mra' is 'COMRADE'.
Can you help me to learn more?
(Other definitions for comrade that I've seen before include "Fellow-soldier" , "Fellow member of the armed forces" , "Fellow socialist or good friend" , "Fellow-in-arms" , "Colleague" .)