Close noisily (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">close noisily</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 slam that I've seen before include "Close noisily" , "A grand one is 13 tricks" , "If it's grand, it wins all 13 tricks in bridge game" , "Shut hard" , "Crash (door closed)" .)