Filed from 3 published puzzles

DISTILL

Set to 3 different clues across 3 published puzzles, most often “Concentrate” — The New York Times, Sunday, 15 April 2001.

7 letters

Every clue on record, most used first

Concentrateonce
The New York Times — Sunday, 15 April 2001
Concentrate, in a wayonce
The New York Times — Sunday, 28 January 2001
Refineonce
The New York Times — Wednesday, 7 June 1995

Other answers to these clues

FOCUS5 letters
SMELT5 letters
THINK5 letters