Cryptic crossword clue
Collection of planets: Mars and — yes — lots spinning 5,6

The most common and most likely answer to this crossword clue is the 5 plus 6 letter word SOLAR SYSTEM

S
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Buddy explains!

The straight part
We know that "Collection of planets" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case collection of planets = solar system.
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.

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