I don't say that the problem is your pump, in fact there's a good possibility that it's OK. It can however leak without making bearing noise. There is a weep hole in the area aft of the pulley that is designed to allow coolant to exit if the internal impeller seal goes kaput.

From your observations, the hose clamp may have been the culprit, but have you checked the gasket sealing the thermostat housing? Most new thermostats come with a gasket, but there are some extremely thin gaskets and others better that are thicker. I have had times when I had to replace the gasket supplied with a new thermostat with a thicker one due to leaking caused by a thin gasket.

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