Story of river rat with green clothing (9)
I believe the answer is:
narrative
'story' is the definition.
('narrative' can be a synonym of 'story')
'river rat with green clothing' is the wordplay.
'river' becomes 'r'.
'with' says to put letters next to each other.
'green' becomes 'naive' ('naive' can be similar in meaning to 'green'**).
'clothing' is an insertion indicator.
'r'+'rat'='rrat'
'rrat' put into 'naive' is 'NARRATIVE'.
'of' is the link.
(Other definitions for narrative that I've seen before include "Storyline" , "Chronicle" , "Account describing events" , "Story recounting events" , "Story line" .)