Major dis (4)
I believe the answer is:
slam
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">major dis</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 slam that I've seen before include "Shut (a door) noisily" , "A grand one is 13 tricks" , "Winning all (or all but one) of the tricks in bridge" , "Close noisily" , "(Almost) all the tricks" .)