"Um, excuse me" (4)
I believe the answer is:
ahem
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">um excuse me</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 ahem that I've seen before include "Excuse me!" , "Throat clearance to attract attention" , "Expression of disapproval" , "Sound used to attract attention" , "Cough to draw attention" .)