Undo a bit, as a tie (6)
I believe the answer is:
loosen
(Other definitions for loosen that I've seen before include "Untie, relax" , "Relax the tension" , "Work free" , "Make less tight, slacken" , "Undo a little" .)
I believe the answer is:
loosen
(Other definitions for loosen that I've seen before include "Untie, relax" , "Relax the tension" , "Work free" , "Make less tight, slacken" , "Undo a little" .)