Filed from 6 published puzzles

GUSH

Set to 6 different clues across 6 published puzzles, most often “Ooh and aah” — The New York Times, Sunday, 5 June 2011.

4 letters

Every clue on record, most used first

Ooh and aahonce
The New York Times — Sunday, 5 June 2011
Wax rhapsodiconce
The New York Times — Sunday, 16 July 2006
Be oversentimentalonce
The New York Times — Wednesday, 27 April 2005
Opposite of oozeonce
The New York Times — Monday, 2 December 2002
Effuseonce
The New York Times — Sunday, 8 July 2001
Talk effusivelyonce
The New York Times — Sunday, 11 July 1999