Crossword Genius

Biker tossed aside picture books about the kraken? (7)

Ross

I believe the answer is:

octopus

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

'kraken?' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'biker tossed aside picture books about' is the wordplay.
I cannot really see how this works, but
'about' could be 'c' (circa) and 'c' is located in the answer.
'books' could be 'ot' (abbreviation for Old Testament) and 'ot' is found in the leftover letters.
The remaining letters 'opus' 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).

'the' acts as a link.

Can you help me to learn more?

(Other definitions for octopus that I've seen before include "Mollusc with long tentacles" , "Long-tentacled creature" , "large, influential organization" , "Eight-limbed cephalopod" , "something from La Mer?" .)

I've seen this clue in The Irish Times.
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