Reform of the old Indian bureaucracy’s code of conduct (6)
I believe the answer is:
ethics
'code of conduct' is the definition.
'reform of the old indian bureaucracy's' is the wordplay.
'reform of' indicates anagramming the letters (I've seen this in other clues).
'old indian bureaucracy' becomes 'ics' (abbreviation for Indian Civil Service).
'the' with letters rearranged gives 'eth'.
'eth'+'ics'='ETHICS'
(Other definitions for ethics that I've seen before include "System of morals" , "Study of moral values and rules" , "Code of integrity in business" , "Codes of practice for businessmen" , "Principles to be observed by business and professions" .)