Cover (a sword) (7)
I believe the answer is:
sheathe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cover a sword</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sheathe that I've seen before include "stow away safely" , "Put (a sword) into case" , "Protective cover, for sword say" , "Encase in protection" , "Cover in case" .)