Left former revered figure a dictionary? (7)
I believe the answer is:
lexicon
'a dictionary?' is the definition.
('lexicon' can be a synonym of 'dictionary')
'left former revered figure' is the wordplay.
'left' becomes 'L' (common abbreviation).
'former' becomes 'ex' (prefix meaning former or onetime).
'revered figure' becomes 'icon' (an icon is a celebrated figure).
'l'+'ex'+'icon'='LEXICON'
(Other definitions for lexicon that I've seen before include "reference work?" , "Dictionary of terms" , "Vocabulary - dictionary" , "Dictionary, especially of ancient languages" , "(Classical) dictionary" .)