Lever (5)
'lever' is the definition.
(I know that pedal is a type of lever)
This is all the clue.
(Other definitions for pedal that I've seen before include "Brake or clutch perhaps" , "Ride a bicycle" , "Travel by bike" , "One of two a cyclist needs" , "Foot-operated control" .)
'lever' is the definition.
(a lever is a bar attached to a machine)
This is the entire clue.
(Other definitions for bar that I've seen before include "Bank, shoal" , "Stop" , "Length of wood or metal - drinking place" , "Iron rod or drinks counter" , "See 9" .)