Cryptic crossword clue
Lacking faith in vessel, do glide westwards 7

The most common and most likely answer to this crossword clue is the 7 letter word GODLESS

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

The straight part
We know that "Lacking faith" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lacking faith = godless.
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 GODLESS mean?

GODLESS adjective
  1. Not acknowledging any deity or god; without belief in any deity or god.
  2. Evil, wicked, worldly.

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