Section of Rubicon I consider very famous (6)
I believe the answer is:
iconic
'very famous' is the definition.
(I've seen this before)
'section of rubicon i consider' is the wordplay.
'section of' indicates a hidden word.
'ICONIC' is hidden within 'rubicon i consider'.
(Other definitions for iconic that I've seen before include "Representatively symbolic" , "Stand-out" , "Like a symbol/image" , "Symbolically representative" , "Serving as a significant symbol" .)