Filed from 3 published puzzles

LARVAL

Set to 3 different clues across 3 published puzzles, most often “Premetamorphic” — The New York Times, Friday, 22 March 2002.

6 letters

Every clue on record, most used first

Premetamorphiconce
The New York Times — Friday, 22 March 2002
Immatureonce
The New York Times — Thursday, 23 November 1995
Relating to young insectsonce
The New York Times — Friday, 4 August 1995

Other answers to these clues

BABYISH7 letters
UNRIPE6 letters