Novelist on line leaves (8)
I believe the answer is:
greenery
'leaves' is the definition.
(I've seen this before)
'novelist on line' is the wordplay.
'novelist' becomes 'greene' (I've seen this before).
'on' means one lot of letters go next to another.
'line' becomes 'ry' (abbreviation for railway).
'greene'+'ry'='GREENERY'
(Other definitions for greenery that I've seen before include "Leaves etc" , "Decorative boughs" , "Living foliage or vegetation" , "Foliage used for decoration" , "Leafy vegetation" .)