Cryptic crossword clue
Mars — a visitto be arranged? ET

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

I've seen this crossword clue in The Guardian
V
I
T
I
A
T
E
S

Buddy explains!

The straight part
We know that "Mars" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mars = vitiates.
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 VITIATES mean?

VITIATES verb
  1. To spoil, make faulty; to reduce the value, quality, or effectiveness of something
  2. To debase or morally corrupt
  3. To violate, to rape
  4. To make something ineffective, to invalidate

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