Dry heave (5)
I believe the answer is:
retch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dry heave</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 retch that I've seen before include "Try to vomit" , "Strain throat as if vomiting" , "Sound and seem to vomit" , "Try to be sick" , "Strain as if to vomit" .)