Revitalisation (13)
I believe the answer is:
resuscitation
'revitalisation' is the definition.
(resuscitation is a kind of revitalisation)
This is all the clue.
(Other definitions for resuscitation that I've seen before include "Act of returning someone to consciousness" , "freeing the airways" , "Return of vitality" , "Act of bringing back to consciousness" , "Revival, restoration" .)