Fare-well link (4)
I believe the answer is:
'fare-well link' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for thee that I've seen before include "Archaic form of 'you'" , "Quaker 'you'" , "You in the olden days" , "Old objective second person singular" , "'U'" .)