GI on the lam (4)
I believe the answer is:
awol
'gi on the lam' 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 "unaccounted for" , "'Absent without permission, initially (4)'" , "Missing without permission" , "Take unofficial leave (abbrev.)" , "On the lam" .)