Everything in books gives courage (5)

I believe the answer is:

balls

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'courage' is the definition.
(thesaurus)

'everything in books' is the wordplay.
'everything' becomes 'all' (all things).
'in' indicates putting letters inside.
'books' becomes 'bs' (I am not sure about this - if you are sure you should believe this answer much more).
'all' going inside 'bs' is 'BALLS'.

'gives' acts as a link.

Can you help me to learn more?

(Other definitions for balls that I've seen before include "Rubbish" , "Formal dances" , "nonsense" , "See 7" , "deliveries" .)

I've seen this clue in The Guardian.

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