Always in the right to turn back (6)
I believe the answer is:
revert
'to turn back' is the definition.
('revert' can be a synonym of 'turn back')
'always in the right' is the wordplay.
'always' becomes 'ever' (synonyms).
'in' is an insertion indicator.
'the right' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable).
'ever' inserted into 'rt' is 'REVERT'.
(Other definitions for revert that I've seen before include "Backslide, return to former state" , "Go back to former condition" , "Turn back" , "Return to former condition or habit" , "Go back to a previous state" .)