Filed from 6 published puzzles

FLUENT

Set to 5 different clues across 6 published puzzles, most often “Smooth” — The New York Times, Saturday, 1 January 2005.

6 letters

Every clue on record, most used first

Smooth2 times
The New York Times — Saturday, 1 January 2005
Well-spokenonce
The New York Times — Wednesday, 29 October 2003
Polished, languagewiseonce
The New York Times — Wednesday, 14 August 2002
Linguistically knowledgeableonce
The New York Times — Wednesday, 8 October 1997
Smooth-talkingonce
The New York Times — Thursday, 24 November 1994

Other answers to these clues

CREAMY6 letters
EASE4 letters
EASY4 letters
EVEN4 letters
FACILE6 letters
FILE4 letters
FLOWING7 letters
GLASSY6 letters
GLIB4 letters
IRON4 letters
IRONOUT7 letters
OILY4 letters