Crossword Genius

Volume of cyclamen released by black economy (4)

Ross

I believe the answer is:

book

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

'volume' is the definition.
(I know this)

'of cyclamen released by black economy' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is present in the answer.
'black' could be 'b' (as in pencil classifications) and 'b' is found within the answer.
The remaining letters 'ok' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for book that I've seen before include "Leaves, bound" , "Strict rules" , "Reserve;tome" , "Quick work" , "Reserve - publication" .)

I've seen this clue in The Irish Times and the Irish Times (Crosaire).
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