Abundantly productive (8)
I believe the answer is:
prolific
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abundantly productive</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for prolific that I've seen before include "Abundant in growth" , "Producing fruit in abundance" , "Producing many works" , "Abounding" , "Rich" .)