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Summary
in
short,
great
book
(7)
Summary in short, great book (7)
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The definition is at the beginning of the clue.
How the clue works
Summary's your definition there, pointing to a condensed version of something. Now, "great" gives you EPIC, but "in short" tells you to lop that down to EPI, then just bolt on TOME for "book" — stick them together and you're there.