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 they are linked in a way I don't understand?
'by one form of greed' is the wordplay.
'by' means one lot of letters go next to another.
'one' becomes 'an' (an apple is one apple).
'form of' indicates an anagram (the letters need to be in another 'form').
'greed' with letters rearranged 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.)" .)