Possible Clues:

• Sec'y, e.g.
• Second-in-command: abbr.
• Secy., e.g.
• Mgr.'s right hand
• Office aide: Abbr.
• Adjutant: Abbr.
• __ mgr.
• Coach's helper (Abbr.)
• Mgr.'s right-hand man
• __ D.A.