"Hey, over here!" (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hey over here</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 psst that I've seen before include "Hissing noise to attract attention" , "Sound used to attract someone's attention" , "Attention-seeking noise" , "way of attracting attention" , "Notice me" .)