Rage consumes extremely vindictive person seeking retribution (7)
I believe the answer is:
avenger
'person seeking retribution' is the definition.
I can't tell whether this definition defines the answer.
'rage consumes extremely vindictive' is the wordplay.
'rage' becomes 'anger' (I've seen this in another clue).
'consumes' indicates putting letters inside.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'vindictive' with its middle removed is 've'.
'anger' placed around 've' is 'AVENGER'.
Can you help me to learn more?
(Other definitions for avenger that I've seen before include "One doing harm to get their own back" , "one evening?" , "One exacting payback on another's behalf" , "Inflicter of retribution" , "Mrs Peel?" .)