Keen to agree to change (5)
I believe the answer is:
'keen' is the definition.
(I've seen this in another clue)
'agree to change' is the wordplay.
'to change' indicates an anagram.
'agree' with letters rearranged gives 'EAGER'.
'to' acts as a link.
(Other definitions for eager that I've seen before include "Anxious" , "Showing keen interest" , "really keen" , "Like some beavers" , "Sharp" .)