Replant or clip if very productive (8)
I believe the answer is:
prolific
'very productive' is the definition.
(I've seen this before)
'replant or clip if' is the wordplay.
'replant' indicates anagramming the letters (I've seen this in other clues).
'or'+'clip'+'if'='orclipif'
'orclipif' with letters rearranged gives 'PROLIFIC'.
(Other definitions for prolific that I've seen before include "Highly productive, fruitful" , "Abundantly productive" , "Rich" , "Very fertile, productive" , "Producing a great amount, as writer may" .)