Public radio host Glass (3)
I believe the answer is:
ira
'public radio host glass' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ira that I've seen before include "Militant Irish nationalist organisation" , "George Gershwin's older brother, the lyricist" , "George 13 down's brother" , "Illegal organisation, initially" , "Gershwin, say" .)