A fool for quietly producing fake news? (8)
I believe the answer is:
agitprop
'fake news?' is the definition.
(agitprop means political propaganda)
'a fool for quietly' is the wordplay.
'fool' becomes 'git' (I've seen this in other clues).
'for' becomes 'pro' (as in being 'pro' something).
'quietly' becomes 'p' (p for piano and quiet).
'a'+'git'+'pro'+'p'='AGITPROP'
'producing' is the link.
(Other definitions for agitprop that I've seen before include "'Political agitation and propaganda, in short (8)'" , "Culturally delivered political propaganda -- a top grip (anag)" , "Revolutionary stirring" , "Political promotion (especially in the arts)" , "Form of propaganda" .)