It was rather small and had brown plumage just like a hen but on closer inspection, also a yellow bill (hens have dark brown/orange bills). It was most likely a drake in his summer clothes aka eclipse plumage.
We wonder if Tipsy is considering him for a mate for next spring. We think she would have better chance with an older and more experienced partner. Still, we are glad Tipsy has a friend to hang out with for the remaining days before their winter migration.