Filed from 5 published puzzles

DINGDONG

Set to 5 different clues across 5 published puzzles, most often “Crackpot” — The New York Times, Monday, 1 December 2003.

8 letters

Every clue on record, most used first

Crackpotonce
The New York Times — Monday, 1 December 2003
Knock alternativeonce
The New York Times — Saturday, 17 May 2003
"Who is it?" prompteronce
The New York Times — Friday, 12 July 2002
Announcement of a visitoronce
The New York Times — Saturday, 21 April 2001
Call from the front dooronce
The New York Times — Tuesday, 24 August 1999

Other answers to these clues

KOOK4 letters
KOOKY5 letters
LOON4 letters
LUNATIC7 letters
MANIAC6 letters
NUT3 letters