Age in vitro in order to revitalise (10)
I believe the answer is:
invigorate
'revitalise' is the definition.
Both the answer and definition are verbs in their base form.
Maybe there's an association between them I don't understand?
'age in vitro in order' is the wordplay.
'in order' indicates anagramming the letters (the letters in a new order).
'age'+'in'+'vitro'='ageinvitro'
'ageinvitro' with letters rearranged gives 'INVIGORATE'.
'to' is the link.
Can you help me to learn more?
(Other definitions for invigorate that I've seen before include "Perk up" , "Give energy to" , "Liven up" , "Give strength to" , "Strengthen" .)