Three short lines set up a small, strange scene: a golden eagle appears in a city street, and a group of clerks respond by singing to it about Creation. The street names, Fetter Lane and Shoe Lane, sound like ordinary, practical London places (the poem doesn't say more, but the names suggest a busy working district). That plainness makes the eagle's arrival feel even more startling.
The speaker doesn't explain or react with alarm. The tone is calm, almost matter-of-fact, as if this were simply something that happened. Yet the final line carries a quiet wonder. The clerks, people we might expect to be buried in routine, answer the wild bird with song, and their subject is the biggest one possible.
The mood is hushed and a little dreamlike. The title, "Visitant," suggests something arriving from elsewhere, and the poem seems to treat the eagle that way: a brief glimpse of the wild and the sacred breaking into everyday life, and people rising to meet it.