Cryptic crossword clue
Word used comparatively often before vote, short expression of appreciation 5

The most common and most likely answer to this crossword clue is the 5 letter word THANX

I've seen this crossword clue in The Guardian
T
H
A
N
X

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The straight part
We know that "short expression of appreciation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case short expression of appreciation = thanx.
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 THANX mean?

THANX interjection
  1. Used to express appreciation or gratitude.

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