Bear out of honey finally, after changing fiver (6)
I believe the answer is:
verify
'bear out' is the definition.
(thesaurus)
'honey finally after changing fiver' is the wordplay.
'finally' indicates one should take the final letters.
'after' says to put letters next to each other.
'changing' indicates an anagram.
The last letter of 'honey' is 'y'.
'fiver' is an anagram of 'verif'.
'y' after 'verif' is 'VERIFY'.
'of' acts as a link.
(Other definitions for verify that I've seen before include "Ascertain truth or accuracy" , "Prove to be true" , "Confirm the truth of" , "Check to be true" , "Demonstrate" .)