Serg

4 clues
An NCO
N.C.O.
Army man: Abbr.
Police officer: Abbr.
Similar answers:
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Aaargh
Aalarge
Aalborg
Aargh
Aase
Abackseat
Abacuses
Abardseyeview
Abase
Abaseabass
Abased
Abasement
Abasements
Abaser
Abasers
Abaserunner
Abases
Abatises
Abbesses