Galvanises return of vigour with injection of energy (8)
I believe the answer is:
animates
'galvanises' is the definition.
I can't judge whether this definition defines the answer.
'return of vigour with injection of energy' is the wordplay.
'return of' says the letters should be written backwards.
'vigour' becomes 'stamina' (I've seen this before).
'with' indicates putting letters inside.
'injection of energy' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'stamina' enclosing 'e' is 'setamina'.
'setamina' back-to-front is 'ANIMATES'.
Can you help me to learn more?
(Other definitions for animates that I've seen before include "Enlivens" , "Gives life or movement to, say cartoon" , "Brings to life" .)