Army no-show (4)
I believe the answer is:
awol
'army no-show' 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 "Truant (or just missing)" , "Not present when supposed to be" , "unaccounted for" , "Missing without permission" , "'Absent without permission, initially (4)'" .)