This is just one of many perforated clamp failures I come across, and one reason I no longer trust my vessel, or customers vessels, to them. This clamp was a single clamp, not one of two as it should have been. It was installed on a galley sink drain. The hose was weeping because the single clamp had "slipped" and let go. If that hose had fallen off the boat would have sunk.
To recap, make sure the hose adapter is long enough, use TWO clamps for below waterline applications and consider using a higher quality non-perforated clamp such as those made by AWAB.