Book stores? (9)
I believe the answer is:
libraries
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">book stores?</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 libraries that I've seen before include "Collections" , "facilities for readers" , "Book repositories" , "They house books" , "Book depositories" .)