Sails
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sails</span>' is the definition.<br/ ><span class="explanation-format__explanation">('sheet' can be a synonym of 'sail')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sheets that I've seen before include "Bedclothes to be found on ships?" , "Pieces of paper or bedclothes" , "She set them on the bed" , "Bed coverings for the sailor's ropes" , "Flat pieces, of cloth or paper say" .)