My good man, regularly seen as a wise guy in some famous movies (4)
I believe the answer is:
yoda
'as a wise guy in some famous movies' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'my good man regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'my'+'good'+'man'='mygoodman'
The alternate letters of 'mygoodman' are 'YODA'.
'seen' is the link.
Can you help me to learn more?
(Other definitions for yoda that I've seen before include "Green being" , "Grand Master of the Jedi Order" , "one with idiosyncratic syntax" .)