Tom East's book (4)

I believe the answer is:

tome

'book' is the definition.
(a tome is a book)

'tom east's' is the wordplay.
'east' becomes 'e' (abbreviation).
'tom'+'e'='TOME'

(Other definitions for tome that I've seen before include "Heavy volume" , "A hefty book" , "Large and scholarly book" , "Large heavy book" , "Hefty volume" .)

I've seen this clue in the Evening Standard.

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