The most common and most likely answer to this crossword clue is the 4 letter word RHEA
R
H
E
A
More clues leading to the result RHEA
- Take remedy endlessly being a type of eastern nettle
- Artist embracing explosive goddess
- Bird he’s introduced to artist
- Bird caged by our headmaster
- Artist catches male bird
- In Chester he accommodated a flightless bird
- Hear cuckoo and another bird
- Artist capturing male bird that can't fly
- Some twitcher hears ostrich-like bird
- Hear strange bird
Buddy explains!

The straight part
We know that "Satellite of Saturn" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case satellite of saturn = rhea.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 RHEA mean?
RHEA noun- A large flightless bird of the genus Rhea, native to South America.
- Ramie (Boehmeria nivea), a fiber-yielding plant.