Preserve in vinegar (6)
I believe the answer is:
pickle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">preserve in vinegar</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 pickle that I've seen before include "imp" , "Preserve; muddle" , "Solution for preserving food" , "Lather - relish" , "Sticky situation" .)