Hindu ascetic sorry over discontented Hindu (5)
I believe the answer is:
sadhu
'hindu ascetic' is the definition.
(Hindu sage or ascetic)
'sorry over discontented hindu' is the wordplay.
'sorry' becomes 'sad' (similar in meaning).
'over' is a charade indicator (letters next to each other).
'discontented' says to hollow out the word (remove centre letters).
'hindu' with its centre removed is 'hu'.
'sad'+'hu'='SADHU'
(Other definitions for sadhu that I've seen before include "one choosing austerity" , "Hindu wandering holy man" , "Indian holy man or sage" , "Indian wandering holy man" , "Ascetic" .)