Greek peace goddess (5)
I believe the answer is:
'greek peace goddess' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for irene that I've seen before include "woman" , "US actress, -- Dunne" , "Girl's name; Soames Forsyte's first wife" , "Greek goddess of peace (English name)" , "Peaceful girl" .)