Glass of "This American Life” (3)
I believe the answer is:
ira
'glass of this american life' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ira that I've seen before include "Illegal organisation, in short" , "George Gershwin's older brother, the lyricist" , "Militant Irish nationalist organisation" , "nationalists" , "George 13 down's brother" .)