King, queen or rook (5)
I believe the answer is:
piece
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">king</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">queen or rook</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that queen is a type of chess piece)</span><br/ ><br/ ></span>
(Other definitions for piece that I've seen before include "One part of a whole" , "Section; firearm" , "Bit - part" , "one of eight once ready for the Spanish?" , "Part - portion" .)