Final warning (9)
I believe the answer is:
ultimatum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">final warning</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ultimatum that I've seen before include "Uncompromising demand" , "Final warning" , "A final demand - or else" , "Final offer" , "Final point" .)