Crossword Genius

Something entertaining that's repeated in books (3,5)

Ross

I believe the answer is:

aga sagas

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'something entertaining' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'repeated in books' is the wordplay.
'repeated' indicates the doubling of some letters.
'in books' becomes 'agas' (I can't explain this - if you can you should believe this answer much more).
'agas' doubled is 'AGA-SAGAS'.

'that's' is the link.

Can you help me to learn more?

(Other definitions for aga sagas that I've seen before include "Middle-class semi-rural novels" , "middle-class tales?" , "popular British novels" .)

I've seen this clue in The Telegraph.
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