The most common and most likely answer to this crossword clue is the 8 plus 7 letter word AUTUMNAL EQUINOX
A
U
T
U
M
N
A
L
E
Q
U
I
N
O
X
More clues leading to the result AUTUMNAL EQUINOX
Buddy explains!
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.