Don’t Let This Crossword Stump You – Master the Clue for a Smooth Engine Run

– Word meaning to make a continuous low buzzing sound: continuous, buzzing sound
– Synonym of “vibrate”: vibrate
– Sound made by certain insects: insects, sound
– Noise made by an electrical appliance when it’s switched on: electrical appliance, noise, switched on
– A functional noise made by a well-oiled machine: functional noise, well-oiled machine
– A monotonous sound typically indicative of a functioning engine: monotonous sound, functioning engine, typical, indicative
– An engine noise that suggests it’s functioning effortlessly: engine noise, functioning effortlessly, suggests