Cryptic crossword clue
Large dock arranged private security measure

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

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "security measure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case security measure = lockdown.
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 LOCKDOWN mean?

LOCKDOWN noun
  1. The confinement of people in their own rooms (e.g. in a school) or cells (in a prison), or to their own homes or areas (e.g. in the case of a city- or nation-wide issue) as a security measure after or amid a disturbance or pandemic, etc.
  2. A contrivance to fasten logs together in rafting.

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