Restore to rate outside; renege going back (10)
I believe the answer is:
regenerate
'restore' is the definition.
(I know that restore can be written as regenerate)
'rate outside renege going back' is the wordplay.
'outside' is an insertion indicator.
'going back' says the letters should be written in reverse.
'renege' written backwards gives 'egener'.
'rate' placed around 'egener' is 'REGENERATE'.
'to' acts as a link.
(Other definitions for regenerate that I've seen before include "Restored" , "Restore to life" , "morally reformed" , "Give new life to" , "promote new growth" .)