Sword or dagger sheath (8)
I believe the answer is:
scabbard
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sword or dagger sheath</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 scabbard that I've seen before include "foil container?" , "foil cover?" , "You may see one holding a dagger" , "Sword holder" , "sword-carrier" .)