Note everyone has resentment (4)
I believe the answer is:
gall
'resentment' is the definition.
(I know that gall is a class)
'note everyone' is the wordplay.
'note' becomes 'g' (musical note).
'everyone' becomes 'all' (all people).
'g'+'all'='GALL'
'has' acts as a link.
(Other definitions for gall that I've seen before include "Irritate - presumption" , "Liver's secretion" , "Ill-will - bile" , "Impudence; bitterness" , "Brass nedk or bile" .)