The most common and most likely answer to this crossword clue is the 9 letter word MATUTINAL
I've seen this crossword clue in The Times
M
A
T
U
T
I
N
A
L
More clues leading to the result MATUTINAL
Buddy explains!

The straight part
We know that "in the morning" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in the morning = matutinal.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 MATUTINAL mean?
MATUTINAL adjective- Of, occurring in, or relating to the early morning.