World map finally detailed (5)
I believe the answer is:
atlas
'world map' is the definition.
'atlas' can be an answer for 'map' (thesaurus). I'm not sure about the 'world' bit.
'finally detailed' is the wordplay.
'finally' becomes 'at last' (synonyms).
'detailed' means to remove the last letter (the tail of the word is removed).
'atlast' with its final letter taken off is 'ATLAS'.
Can you help me to learn more?
(Other definitions for atlas that I've seen before include "I carry a huge weight" , "Chart book" , "Book of geography" , "Album of maps" , "Sky-toting Titan" .)