Be abrupt (4)
I believe the answer is:
snap
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be abrupt</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for snap that I've seen before include "Unpremeditated - bite" , "Simple card-game" , "Short spell" , "Break suddenly and abruptly" , "Bite at or utter angry words" .)