Struggled for breath (6)
I believe the answer is:
gasped
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">struggled for breath</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for gasped that I've seen before include "Took a sharp breath" , "Struggled for breath" , "Breathed noisily" , "'Panted, puffed (6)'" , "Drew in breath sharply, as in surprise" .)