Cryptic crossword clue
Stellar couples sign book in advance 8

The most common and most likely answer to this crossword clue is the 8 letter word BINARIES

I've seen this crossword clue in The Guardian
B
I
N
A
R
I
E
S

Buddy explains!

The straight part
We know that "Stellar couples" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stellar couples = binaries.
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 BINARIES mean?

BINARIES noun
  1. A thing which can have only (one or the other of) two values.
  2. The bijective base-2 numeral system, which uses only the digits 0 and 1.
  3. An executable computer file.
  4. A satellite system consisting of two stars or other bodies orbiting each other.

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