Crossword Genius

Concealed, I pay in bits for book of knowledge (13)

Ross

I believe the answer is:

encyclopaedia

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

'book of knowledge' is the definition.
'encyclopaedia' can be an answer for 'book' (encyclopaedia is a kind of book). I am not sure about the 'of knowledge' bit.

'concealed i pay in bits' is the wordplay.
'concealed i pay' anagrams to 'ENCYCLOPAEDIA'.
Though, I'm not clear how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for encyclopaedia that I've seen before include "Large reference book" , "Large reference work" , "Extensive reference work" , "Book covering whole range of knowledge" , "source of information" .)

I've seen this clue in The Hindu.
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