Go back on the revision of a decree (6)
I believe the answer is:
recede
'go back' is the definition.
(I've seen this before)
'the revision of a decree' is the wordplay.
'the revision of' indicates an anagram.
'decree' is an anagram of 'RECEDE'.
'on' acts as a link.
(Other definitions for recede that I've seen before include "Withdraw" , "Go backwards" , "Become more distant" , "Move backward" , "Decline" .)