Pant (4)
I believe the answer is:
gasp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for gasp that I've seen before include "Short laboured intake of breath" , "Say "ah"" , "Fight for breath" , "Draw breath sharply" , "Noisily breathe" .)