Traveler's aid (5)
I believe the answer is:
atlas
'traveler's aid' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for atlas that I've seen before include "Sort of book" , "He had the world on his shoulders" , "Cartographer's work" , "N African mountains - seemaps book" , "African mountain range" .)