Illuminated the time of true revolutionary writing (10)
I believe the answer is:
literature
'revolutionary writing' is the definition.
'literature' can be an answer for 'writing' (literature is a kind of writing). I am not sure about the 'revolutionary' bit.
'illuminated the time of true' is the wordplay.
'illuminated' becomes 'lit' (synonyms).
'the time' becomes 'era' (an era is a period of time).
'of' is an anagram indicator (the answer comes from or 'of' the letters).
'true' anagrammed gives 'ture'.
'lit'+'era'+'ture'='LITERATURE'
Can you help me to learn more?
(Other definitions for literature that I've seen before include "Work by Spenser for instance" , "writer's work" , "Written works of artistic merit" , "Printed matter" , "promotional material" .)