Soldier being discreet (7)
I believe the answer is:
private
I believe this clue is a double definition.
'soldier' is the first definition.
(private is a type of soldier)
'discreet' is the second definition.
(thesaurus)
'being' acts as a link.
(Other definitions for private that I've seen before include "Ordinary soldier" , "retiring" , "Army three Dn" , "Rank, concealed" , "(Of a place) secluded" .)