Unusually eager to come to terms (5)
I believe the answer is:
agree
'come to terms' is the definition.
(I've seen this in another clue)
'unusually eager' is the wordplay.
'unusually' indicates an anagram.
'eager' anagrammed gives 'AGREE'.
'to' acts as a link.
(Other definitions for agree that I've seen before include "Go well together" , "Match; tally" , "get on" , "'Assent, concur (5)'" , "share the same view" .)