Cryptic crossword clue
Key point about sci-fi is not to start getting cross 8

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

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "cross" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cross = crucifix.
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.

Crossword Answer definitions

CRUCIFIX noun
  1. A wooden cross used for crucifixions, as by the Romans.
  2. An ornamental or symbolic sculptural representation of Christ on a cross, often worn as a pendant or displayed in a Christian church.
  3. The iron cross, a position on the rings where the gymnast holds the rings straight out on either side of the body.

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