Crossword Genius

Poetic time of day . . . and a clue to the circled square in this row (4)

Ross

I believe the answer is:

morn

(Other definitions for morn that I've seen before include "Day's first part(poetic)" , "PM? No" , "Early part of day (poetic)" , "First part of day (poet.)" .)

I've seen this clue in The New York Times.
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