Character in Antigone say guzzled rolls (3)
I believe the answer is:
eta
'character in antigone say' is the definition.
(Greek letter - Antigone is a Greek play)
'guzzled rolls' is the wordplay.
'guzzled' becomes 'ate' (guzzle can mean to eat).
'rolls' says the letters should be written backwards (I've seen 'rolling' mean this).
'ate' written backwards gives 'ETA'.
(Other definitions for eta that I've seen before include "when it might reach us?" , "Letter of Greek alphabet" , "Letter from Doris" , "When's end of journey predicted" , "Basque separatist movement" .)