Discharge from army (5)
I believe the answer is:
demob
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">discharge from army</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for demob that I've seen before include "Discharge from army" , "Retire from military service" , "Honourably discharge" , "put out of service" , "remove from service" .)