Chart-topping production of Paperback Writer? (4,6)

I believe the answer is:

best seller

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'chart-topping production' is the definition.
'best seller' can be an answer for 'production' (best seller is a kind of production). I'm not sure about the 'chart-topping' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for best seller that I've seen before include "Popular book" , "Blockbuster" , "What many people are buying" , "Book bought by many" , "Book bought in large numbers" .)

I've seen this clue in The Times.

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