Quick to agree to change (5)
I believe the answer is:
eager
'quick' is the definition.
(thesaurus)
'agree to change' is the wordplay.
'to change' indicates anagramming the letters.
'agree' with letters rearranged gives 'EAGER'.
'to' acts as a link.
(Other definitions for eager that I've seen before include "Like some beavers" , "Keenly interested" , "hungry" , "Full of enthusiasm" , "Enthusiastic, full of desire" .)