Cryptic crossword clue
Warning siren worried guards back to tag immigrants

The most common and most likely answer to this crossword clue is the 10 letter word FOREIGNERS

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

The straight part
We know that "immigrants" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case immigrants = foreigners.
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.

Crossword Answer definitions

FOREIGNERS noun
  1. A person from a foreign country.
  2. A private job run by an employee at a trade factory rather than going through the business.

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