Vice and anger could become a source of resentment (9)
I believe the answer is:
grievance
'resentment' is the definition.
(I know that grievance is a type of resentment)
'vice and anger could become' is the wordplay.
'and' means one lot of letters go next to another.
'could become' indicates anagramming the letters.
'vice'+'anger'='viceanger'
'viceanger' anagrammed gives 'GRIEVANCE'.
'a source of' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for grievance that I've seen before include "Bad feeling" , "Complaint" , "Reason for dissatisfaction" , "beef" , "gripe" .)