Game with nine rooms (4)
I believe the answer is:
clue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">game with nine rooms</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for clue that I've seen before include "Hint towards solution" , "one of 28 here" , "It's here top be solved" , "contribution to crossword" , "Aid to puzzlers" .)