Gone away (3)
I believe the answer is:
off
I believe this is a double definition.
'gone' is the first definition.
(I've seen this before)
'away' is the second definition.
(I know that away can be written as off)
(Other definitions for off that I've seen before include "Spoiled; unavailable" , "below par" , "Away - sick?" , "Temporarily not on the menu" , "Away, or beginning to decay" .)