The most common and most likely answer to this crossword clue is the 8 plus 5 letter word SERGEANT MAJOR
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The straight part
We know that "Officer’s" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case officer’s = sergeant major.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 SERGEANT MAJOR mean?
SERGEANT MAJOR noun- A senior non-commissioned appointment in the Army of a company or unit, directly responsible to the officer in charge for their soldiers' performance, standards, discipline, morale, welfare, et al, that can be held by a Warrant Officer or above.
- (plural sergeants major) The most senior rank of non-commissioned officer in the United States Army, ranking above a first sergeant. In the United States Marine Corps it ranks above First Sergeant and is equal in grade to Master Gunnery Sergeant.
- (plural sergeant majors) An appointment (not a rank) in the British Army and Royal Marines, denoting the most senior non-commissioned officer in a battalion, regiment or company.
- (plural sergeant majors) An appointment (not a rank) in the Singapore Army and National Cadet Corps, denoting the most senior non-commissioned officer in a battalion, regiment, company or unit.
- A fish, the pintano (Abudefduf saxatilis).