Gratify by eluding reform
I believe the answer is:
indulge
'gratify' is the definition.
(synonyms)
'eluding reform' is the wordplay.
'reform' indicates an anagram (letters in a new form).
'eluding' with letters rearranged gives 'INDULGE'.
'by' is the link.
(Other definitions for indulge that I've seen before include "Enjoy to excess" , "pet" , "Satisfy (an interest)" , "Gratify a wish" , "Drink too much" .)