Cryptic crossword clue
Hold up in one country military establishment 12

The most common and most likely answer to this crossword clue is the 12 letter word INSTALLATION

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

The straight part
We know that "military establishment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case military establishment = installation.
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 INSTALLATION mean?

INSTALLATION noun
  1. An act of installing.
  2. Something installed, especially the whole of a system of machines, apparatus, and accessories, when set up and arranged for practical working, as in electric lighting, transmission of power, etc.
  3. A work of installation art.
  4. A grouping of facilities that constitute a permanent military base.

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