No-show GI (4)
I believe the answer is:
awol
'no-show gi' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for awol that I've seen before include "Not present when supposed to be" , "unaccounted for" , "'Absent without permission, initially (4)'" , "Of soldier, illegally absent - initially" , "Absent without permission, in short" .)