Crossword Genius

Rule book (5)

Ross

I believe the answer is:

order

I believe this clue is a double definition.

'rule' is the first definition.
(I know that order is a type of rule)

'book' is the second definition.
(order book is a kind of book)

(Other definitions for order that I've seen before include "Command harmony" , "eg OBE" , "Kind - sort" , "Ruling" , "Apply for - class" .)

I've seen this clue in The Globe and Mail.
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