Pedal (5)
'pedal' is the definition.
(synonyms)
This is all the clue.
(Other definitions for treadle that I've seen before include "Foot lever giving power" , "Foot-operated lever" , "operate a spinning-wheel" , "Foot lever that works a machine" , "Dear, let a foot lever emerge" .)
'pedal' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for lever that I've seen before include "exert force, in a way" , "Kind of bar for prising or lifting" , "Bar for prising something" , "Rigid bar pivoted about a fulcrum" , "Jemmy" .)
'pedal' is the definition.
(synonyms)
This is all the clue.
(Other definitions for cycle that I've seen before include "Complete circuit" , "Series of stories or poems" , "Sequence of events that repeats" , "Recurring set of events" , "Regularly repeated sequence (of events)" .)