Possible Clues:

• Second hand: Abbr.
• Mgr.'s second-in-command
• Gofer: Abbr.
• Subordinate, for short
• Gofer's title, for short
• Brief second?
• Manager's helper (Abbr.)
• The 'A' in T.A. (Abbr.)
• Type of coach, briefly
• Part of P.D.A.: Abbr