"Hold on!" (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hold on</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for wait that I've seen before include "Serve at table" , "Watchman" , "Delay, stand by" , "Be patient" , "Bide one's time" .)
(Another definition for wait up that I've seen is " Don't go to bed".)