Map book (5)
I believe the answer is:
atlas
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">map book</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for atlas that I've seen before include "collected world records?" , "One of the Titans" , "Ballistic missile" , "Its architectural name is telamon" , "The first cervical vertebra" .)