Extra run (3)
I believe the answer is:
bye
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">extra run</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bye that I've seen before include "Law of the local authority" , "So long" , "[ADIEU]" , "Cricketing extra" , "(Informal) valediction" .)