Bind again (5)
I believe the answer is:
retie
'bind again' is the definition.
('tie' can be a synonym for 'bind' so perhaps 'retie' is OK for 'bind again')
This is the entire clue.
(Other definitions for retie that I've seen before include "Make knot or bow again" , "Link up again" , "make another knot" , "restore connection" , "Bind again" .)