Cryptic crossword clue
To be clear, on planets not our own there is no opening for life 2,5,5

The most common and most likely answer to this crossword clue is the 2 plus 5 plus 5 letter word IN OTHER WORDS

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

The straight part
We know that "To be clear" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to be clear = in other words.
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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