A last correction for a book of maps (5)
I believe the answer is:
atlas
'book of maps' is the definition.
(synonyms)
'a last correction for a' is the wordplay.
'correction' is an anagram indicator (I've seen this in other clues).
'for' says to put letters next to each other (I've seen this in other clues).
'last' is an anagram of 'tlas'.
'tlas' put after 'a' is 'ATLAS'.
(Other definitions for atlas that I've seen before include "Reference work" , "Map collection" , "I carry a huge weight" , "Geographical book" , "Its architectural name is telamon" .)