Greek god, aggrieved, rises (4)
I believe the answer is:
eros
'greek god' is the definition.
(Eros is an example)
'aggrieved rises' is the wordplay.
'aggrieved' becomes 'sore' (I've seen this before).
'rises' is a reversal indicator.
'sore' reversed gives 'EROS'.
(Other definitions for eros that I've seen before include "Winged archer" , "Cupid, to the Greeks" , "Roman god of love, Cupid" , "Pagan god" , "Cupid's Greek alternative" .)