Draw breath sharply (4)
I believe the answer is:
gasp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">draw breath sharply</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for gasp that I've seen before include "Noisily breathe" , "Convulsive breath" , "Gaps in struggle for breath" , "Short sharp intake of breath" , "Have trouble breathing" .)