Struggle to breathe (4)
I believe the answer is:
gasp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">struggle to breathe</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 gasp that I've seen before include "Sudden intake of breath" , "Say "ah"" , "Draw breath sharply" , "Catch one's breath in astonishment" , "Pant" .)