why would the clutch on car air conditioning stay on when air is shut off on 2009 Honda Civic

battery is being drained over night and car is dead in morning have had system checked and battery is good had to re charge battery have also heard a weid sound and saw smoke come from under hood was told compresser is letting out pressure what would cause this to happen

Asked by for the 2009 Honda Civic
A/C clutch relay stuck(failed in 'on' position).