Go astray with rights on energy (3)
I believe the answer is:
err
'go astray' is the definition.
(to err is to make an error or go the wrong way)
'rights on energy' is the wordplay.
'rights' becomes 'rr' (an abbreviation for right written twice).
'on' is a charade indicator (letters next to each other).
'energy' becomes 'e' (physics symbol as in E=mc2).
'rr' put after 'e' is 'ERR'.
'with' acts as a link.
(Other definitions for err that I've seen before include "Make mistakes" , "Miscalculate" , "have an affair?" , "Bungle" , "Be mistaken" .)