Business directory (6,5)
I believe the answer is:
yellow pages
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">business directory</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for yellow pages that I've seen before include "Directory" , "looking for service here?" , "Telephone reference book" , "Reference book for business numbers" .)