Huff and puff
I believe the answer is:
pant
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">huff and puff</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 pant that I've seen before include "Breathe hard" , "Breathe heavily" , "Sound out of breath" , "Gasp for breath (like a hot dog?)" , "Breathe noisily after running" .)