Lasting source of uplift in English novelist after bringing out one book (7)

I believe the answer is:

durable

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'lasting' is the definition.
(I know that lasting can be written as durable)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for durable that I've seen before include "Good" , "Long-lasting and hard-wearing" , "Lasting a long time" , "Capable of lasting" , "Likely to last" .)

I've seen this clue in The Independent.

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