Turn back, or always right around (6)
I believe the answer is:
revert
'turn back' is the definition.
('revert' can be a synonym of 'turn back')
'always right around' is the wordplay.
'always' becomes 'ever' ('ever' can be a synonym of 'always').
'right' becomes 'rt'.
'around' means one lot of letters goes inside another.
'ever' placed inside 'rt' is 'REVERT'.
'or' acts as a link.
(Other definitions for revert that I've seen before include "Go back to a previous state" , "Regress" , "Go back (to topic)" , "Go back to type" , "Go back to former state or habit" .)