Cryptic crossword clue
Military personnel unessential but in action 14

The most common and most likely answer to this crossword clue is the 14 letter word SUBLIEUTENANTS

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Buddy explains!

The straight part
We know that "Military personnel" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case military personnel = sublieutenants.
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 SUBLIEUTENANTS mean?

SUBLIEUTENANTS noun
  1. A commissioned officer of the navy whose rank is immediately below that of a lieutenant.

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