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.
Crossword Answer definitions
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).