Book range in the end but not completely (5)
I believe the answer is:
atlas
'book range' is the definition.
'atlas' can be an answer for 'range' (I've seen this before). I am not sure about the 'book' bit.
'in the end but not completely' is the wordplay.
'in the end' becomes 'at last' (synonyms).
'but not completely' means to remove the last letter.
'atlast' with its last letter taken away is 'ATLAS'.
(Other definitions for atlas that I've seen before include "book of world records?" , "collected world records?" , "Titan with a fearsome burden" , "Titan who held up the sky" , "Sky-toting Titan" .)