Severe abdominal pain (5)
I believe the answer is:
colic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">severe abdominal pain</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for colic that I've seen before include "gut reaction" , "Spasmodic abdominal pain" , "Intestinal infection" , "Abdominal pain from wind or obstruction" , "A severe tummy ache" .)