Agree to differ, being passionate (5)
I believe the answer is:
eager
'passionate' is the definition.
(thesaurus)
'agree to differ' is the wordplay.
'to differ' indicates an anagram.
'agree' is an anagram of 'EAGER'.
'being' acts as a link.
(Other definitions for eager that I've seen before include "Longing to see" , "Showing keen interest" , "Excited by desire" , "Agree (anag.)" , "Enthusiastic, raring to go" .)