Cryptic crossword clue
Mail difficult to understand — writing perhaps invisible 3

The most common and most likely answer to this crossword clue is the 3 letter word DAK

D
A
K

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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 DAK mean?

DAK noun
  1. A post system by means of transport relays of horses stationed at intervals along a route or network, carrying mail and passengers.

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