Fruitful, productive (8)

I believe the answer is:

prolific

I believe this is a double definition.

'fruitful' is the first definition.
(similar in meaning)

'productive' is the second definition.
(similar in meaning)

(Other definitions for prolific that I've seen before include "Rich" , "Plentiful" , "Intellectually productive" , "Producing a great amount, as writer may" , "Producing much" .)

I've seen this clue in the Sydney Morning Herald.

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