Enduringly popular queen awful revenge consumes (9)
I believe the answer is:
evergreen
'enduringly popular' is the definition.
(I've seen this before)
'queen awful revenge consumes' is the wordplay.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'awful' indicates an anagram.
'consumes' indicates putting letters inside.
'revenge' is an anagram of 'evgreen'.
'er' placed within 'evgreen' is 'EVERGREEN'.
(Other definitions for evergreen that I've seen before include "Holly's one" , "kind of shrub" , "Scots pine, perhaps" , "Of lasting popularity" , "Standard - type of shrub" .)