Daybreak, in verse (4)
I believe the answer is:
morn
'daybreak in verse' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for morn that I've seen before include "PM? No" , "Day's first part(poetic)" , "Early part of day (poetic)" , "First part of day (poet.)" .)