Dog's foe, sometimes (7)
I believe the answer is:
mailman
(Other definitions for mailman that I've seen before include "He delivers the post in the US" , "American man of letters" .)
I've seen this clue in the Universal.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free.
Check out my app
or
learn more
about the Crossword Genius project.