Filed from 4 published puzzles

IMBED

Set to 3 different clues across 4 published puzzles, most often “Fix firmly” — The New York Times, Sunday, 19 May 2002.

5 letters

Every clue on record, most used first

Fix firmly2 times
The New York Times — Sunday, 19 May 2002
Fix firmly: Var.once
The New York Times — Wednesday, 9 September 2009
Insert, as a codeonce
The New York Times — Wednesday, 16 April 2003

Other answers to these clues

CEMENT6 letters
EMBED5 letters
ETCH4 letters
IMPLANT7 letters
INGRAIN7 letters
MOOR4 letters
RIVET5 letters