The most common and most likely answer to this crossword clue is the 10 letter word STARGAZING
I've seen this crossword clue in The Guardian
S
T
A
R
G
A
Z
I
N
G
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.
What does STARGAZING mean?
STARGAZING verb- To look at the stars at night.
- The act of gazing at the stars; astronomy.