Jar top (3)
I believe the answer is:
lid
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jar top</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 lid that I've seen before include "Bottle or jar top" , "Hinged or removable cover as for bottle" , "Covering" , "Top for bottle or eye protector" , "Removable cover of a container" .)