Figure the anti-revolutionary is not English (5)
I believe the answer is:
latin
'not english' is the definition.
'Latin' can be an answer for 'english' (thesaurus). I am not certain of the 'not' bit.
'figure the anti-revolutionary' is the wordplay.
'figure' becomes 'l' (I've seen this in other clues).
'revolutionary' is an anagram indicator.
'anti' anagrammed gives 'atin'.
'l'+'atin'='LATIN'
'is' is the link.
Can you help me to learn more?
(Other definitions for latin that I've seen before include "demanding subject" , "The language of old Rome" , "a quarter of Parisians" , "Cicero's tongue" , "The language of Virgil" .)