Much displeased by one form of greed (7)
I believe the answer is:
angered
'much displeased' is the definition.
The definition and answer can be both to do with human feelings as well as being past participle verbs.
Perhaps you can see a link between them that I don'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' indicates anagramming the letters (the letters need to be in another 'form').
'greed' is an anagram of 'gered'.
'an'+'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.)" .)