Cryptic crossword clue
Impenetrable expression by drunk 8

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

I've seen this crossword clue in Financial Times
A
I
R
T
I
G
H
T


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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 AIRTIGHT mean?

AIRTIGHT adjective
  1. Impermeable to air or other gases.
  2. Having no weak points or flaws.
  3. (of a person) Highly reserved in some matter, particularly tight-lipped or tight-fisted.

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