Plentiful, copious (8)
I believe the answer is:
prolific
This clue is a double definition.
'plentiful' is the first definition.
(I've seen this before)
'copious' is the second definition.
(I've seen this before)
(Other definitions for prolific that I've seen before include "Intellectually productive" , "Producing many works" , "Copious" , "Producing fruit in abundance" , "Abundantly productive" .)