Sudden pain (4)
I believe the answer is:
pang
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sudden pain</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pang that I've seen before include "Short violent pain" , "Stab of emotion" , "Sharp pain, of hunger or emotion perhaps" , "Sharp pain (or similar feeling)" , "Sharp emotional pain" .)