It may be bid (5)
I believe the answer is:
adieu
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">it may be bid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for adieu that I've seen before include "Adios, Arrivederci" , "Leave" , "See you later" , "12 Down" , "Goodbye, mademoiselle" .)