Much displeased by one form of greed (7)
I believe the answer is:
angered
'much displeased' is the definition.
The answer and definition can be both to do with human feelings as well as being past participle verbs.
Maybe you can see an association between them that I can't see?
'by one form of greed' is the wordplay.
'by' is a charade indicator (letters next to each other).
'one' becomes 'an' (an apple is one apple).
'form of' is an anagram indicator (another form of the same letters).
'greed' anagrammed gives 'gered'.
'an' next to 'gered' is 'ANGERED'.
Can you help me to learn more?
(Other definitions for angered that I've seen before include "In high dudgeon" , "Enraged (anag)" , "Very annoyed" , "Infuriated" , "En garde (anag.)" .)