Crossword Genius

Text concise report on effectiveness of deodorant (4)

Ross

I believe the answer is:

book

I'm a little stuck... Click here to teach me more about this clue!

'text' is the definition.
(I know that book is a type of document)

'concise report on effectiveness of deodorant' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is present in the answer.
The remaining letters 'bok' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for book that I've seen before include "Hardback, say" , "Reading volume" , "Show yellow card" , "See 1 ac" , "Tome, volume" .)

I've seen this clue in The Independent.
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