Fake news about East German subject (5)
I believe the answer is:
liege
'subject' is the definition.
(I've seen this before)
'fake news about east german' is the wordplay.
'fake news' becomes 'lie'.
'about' says the letters should be written backwards.
'east' becomes 'e' (abbreviation).
'german' becomes 'g' (abbreviation).
'e'+'g'='eg'
'eg' back-to-front is 'ge'.
'lie'+'ge'='LIEGE'
(Other definitions for liege that I've seen before include "World War one battle site" , "Belgian city or ancient lord" , "On about one East Belgium city" , "Bound to render feudal service" , "Loyal vassal" .)