Retiring soldier (7)
I believe the answer is:
private
This clue is a double definition.
'retiring' is the first definition.
(I've seen this before)
'soldier' is the second definition.
(private is a type of soldier)
(Other definitions for private that I've seen before include "Arm y rank" , "Army rank; secluded" , "Lowest rank of enlisted person" , "Secret - serviceman" , "Unofficial; military rank" .)