Lower radiator hose weeping coolant at water pump

Last summer I replaced the lower radiator hose, and cleaned the water pump inlet, because the lower hose was looking really frail.

Now I have a very very slow leak at that spot. It might almost be too much to call it a leak, but I can see that it has leaked just enough to see that it was not 'coolant tight" and dried in place.

Is it a faulty hose clamp? I might have had it ever so slightly not perpendicular to the direction of the hose...

Water pump inlet corrosion? (there was some...

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