Crossword Genius

Sleeping like one, do you go by the book? (3)

Ross

I believe the answer is:

log

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'the book?' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for log that I've seen before include "A ship's journal" , "Written account of a voyage" , "Bulky piece of wood" , "Piece of cut wood" , "Ship's record" .)

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