Finally trek leader follows maps in a book (2,4)
I believe the answer is:
at last
'finally' is the definition.
(synonyms)
'trek leader follows maps in a book' is the wordplay.
'leader' suggests taking the first letters.
'follows' means one lot of letters go next to another.
'maps in a book' becomes 'atlas' (I can't explain this - if you can you should believe this answer much more).
The first letter of 'trek' is 't'.
't' after 'atlas' is 'AT LAST'.
Can you help me to learn more?
(Other definitions for at last that I've seen before include "Finally, having waited a long time" , "In the end, after much delay" , "'In the end (2,4)'" , "Finally, after much delay" , "Where cobbler located" .)