Places fostering growth of revolutionary lies (7)
I believe the answer is:
forests
'places fostering growth' is the definition.
'of revolutionary lies' is the wordplay.
'revolutionary' is a reversal indicator.
'lies' becomes 'rests' ('rest' can be a synonym of 'lie').
'of' backwards is 'fo'.
'fo'+'rests'='FORESTS'
(Other definitions for forests that I've seen before include "Woodlands" , "Densely wooded areas" , "Large, densely-wooded area" , "Large woods" .)