Keen to agree to change (5)
I believe the answer is:
eager
'keen' is the definition.
(I've seen this in another clue)
'agree to change' is the wordplay.
'to change' indicates anagramming the letters.
'agree' is an anagram of '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" .)