Stung (6)
I believe the answer is:
bitten
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stung</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bitten that I've seen before include "Once this, twice shy they say" , "Seized with the teeth" , "Once ..., twice shy, it's said" , "Wounded (by a snake)" , "Attacked with teeth" .)