ACCEL

Set to 2 different clues across 2 published puzzles, most often “Gradually quickening, in mus.” — The New York Times, Saturday, 13 December 2008.

5 letters

Every clue on record, most used first

Gradually quickening, in mus.once
The New York Times — Saturday, 13 December 2008
Gradually increasing in speed, in mus.once
The New York Times — Friday, 15 March 1996