Hard core intervention needed with a bad habit like greed (7)
I believe the answer is:
avarice
'greed' is the definition.
(avarice is a kind of greed)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for avarice that I've seen before include "Greed - caviare (anag)" , "excessive desire for wealth" , "Insatiable lust" , "Insatiable desire for wealth" , "One of seven deadly sins" .)