Crossword Genius

Finally doesn't finish a book (5)

Ross

I believe the answer is:

atlas

'a book' is the definition.
(atlas is a kind of book)

'finally doesn't finish' is the wordplay.
'finally' becomes 'at last' (synonyms).
'doesn't finish' means to remove the last letter.
'atlast' with its last letter removed is 'ATLAS'.

(Other definitions for atlas that I've seen before include "One greatly burdened" , "Titan who supported the heavens" , "Titan compelled by Zeus to support the sky" , "Sort of book" , "Asian satin" .)

I've seen this clue in The Mirror.
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