Crossword Genius

Altered (anag) — foot-operated pedal (7)

Ross

I believe the answer is:

treadle

(Other definitions for treadle that I've seen before include "machine operator" , "Foot lever giving power" , "Foot-pedal" , "Dear, let a foot lever emerge" , "Alerted (anag)" .)

I've seen this clue in The Guardian.
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