Mention coming back on green, struggling with drive (9)
I believe the answer is:
energetic
'with drive' is the definition.
(with energy or drive)
'mention coming back on green struggling' is the wordplay.
'mention' becomes 'cite' (to cite is to mention or quote).
'coming back' is a reversal indicator.
'on' indicates putting letters inside (as in clothing 'on' a person).
'struggling' indicates anagramming the letters (the letters struggle or wriggle into a new form).
'cite' backwards is 'etic'.
'green' with letters rearranged gives 'nerge'.
'etic' enclosing 'nerge' is 'ENERGETIC'.
(Other definitions for energetic that I've seen before include "Vigorous and dynamic" , "Forceful, vigorous" , "Brisk" , "Very active" , "Full of go" .)