Film based on fact -- it follows King George (4,4)
I believe the answer is:
true grit
'film' is the definition.
(1969 or 2010 Western film)
'based on fact it follows king george' is the wordplay.
'based on fact' becomes 'true' (something factual is true).
'follows' means one lot of letters go next to another.
'king george' becomes 'gr' (Georgius Rex).
'it' after 'gr' is 'grit'.
'true'+'grit'='TRUE GRIT'
(Other definitions for true grit that I've seen before include "movie" , "Genuine courage (John Wayne's)" , "vehicle for John Wayne" , "Western" , "Film" .)