Shocked reaction (4)

I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shocked reaction</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 gasp that I've seen before include "Convulsive breath" , "Breathe irregularly" , "Say "ah"" , "Pant" , "Puff, struggle for breath" .)