Treasure hunter's aid
I believe the answer is:
map
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">treasure hunter's aid</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 map that I've seen before include "Chart" , "Representation of earth's surface as a guide" , "Diagram of part of the earth's surface" , "(Make a) geographical representation" , "Sketch" .)