Jibes (6)
I believe the answer is:
agrees
'jibes' is the definition.
('agree' can be a synonym of 'jibe')
This is the entire clue.
(Other definitions for agrees that I've seen before include "Assents, concurs" , "Grease (anag.)" , "Is of one mind" , "Shakes hands" , "Holds the same opinion" .)