Swallow hard
I believe the answer is:
gulp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swallow hard</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 gulp that I've seen before include "Noise made when swallowing too quickly" , "Swallow noisily" , "Swallow quickly" , "Swallow audibly" , "Audible swallow" .)