The most common and most likely answer to this crossword clue is the 7 letter word MOONSET
M
O
O
N
S
E
T
More clues leading to the result MOONSET
- Second attack when night becomes even darker?
- When heavenly body drops idle god
- Descent of celestial body, twinkling before dawn
- When astronomical body going down, doctor ready to act?
- Flash behind TV when satellite disappears
- Instant before dawn, when satellite disappears
- Doctor No in retreat, ready for the time when the night gets darker
- Second beginning? It is time for retiring satellite
- Shutdown time for today’s satellite viewing?
Buddy explains!

The straight part
We know that "It is time for retiring satellite" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case it is time for retiring satellite = moonset.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 MOONSET mean?
MOONSET noun- The setting of the moon below the horizon