Tamperer hamperer
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tamperer hamperer</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 seal that I've seen before include "Stick down" , "Close tightly - mammal" , "Close - (performing?) animal" , "Ratify" , "Marine mammal for sale" .)