Post office activity, or a hint to this puzzle's theme

Question:

Answer:

LETTERSORTING

Length:

Similar Crossword Questions:

Office building problem that's a hint to this puzzle's theme entries (see their last three letters)
Matchmaker, and a hint to this puzzle's theme
Investigative division (and puzzle theme hint)
Hardly a model of perfection, and a hint to how this puzzle's theme puns are derived
Seasonal workers (and a short hint to this puzzle's theme)
Start of a proverb about consequences ... and a hint to this puzzle's theme
Actual protest activity for tax-and-spend opponents that sets the tone for this puzzle's theme
Board game demand, and hint to this puzzle's theme
''Let it go!'' (and hint to this puzzle's theme)
Garbo line from "Grand Hotel" (and a hint to this puzzle's theme)
Bartender's denial, and a hint to this puzzle's theme
Sidelined by injury, in baseball lingo, and a hint to how this puzzle's theme puns are formed
Job title (giving a hint to this puzzle's theme)
1965 Beach Boys hit, and hint to this puzzle's theme
Attendance check, and a hint to the puzzle theme in the first words of the starred answers
Bargaining phrase ... and a hint to this puzzle's theme
Final attempt to hook up among college students ... or a hint to this puzzle's theme
Driver's request, and a hint to this puzzle's theme
Backside ... or a hint to the puzzle theme
End-of-week cry ... or a hint to the puzzle theme
Fiend ... or a hint to this puzzle's theme
Winter feature with a hint to today's puzzle theme
Automotive part ... and a hint to this puzzle's theme
Sprint to the tape ... and a hint to this puzzle's theme
Process by which an element's atomic number may be reduced, and a hint to this puzzle's theme