The most common and most likely answer to this crossword clue is the 7 letter word PREDAWN
P
R
E
D
A
W
N
More clues leading to the result PREDAWN
Buddy explains!

The straight part
We know that "the early hours" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the early hours = predawn.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PREDAWN mean?
PREDAWN noun- The period immediately preceding dawn.