The most common and most likely answer to this crossword clue is the 5 letter word CORPS
I've seen this crossword clue in The Guardian
C
O
R
P
S
More clues leading to the result CORPS
- Term for driver in police tactical unit
- The noise made by my army band
- Republican gets outside division for tactical purposes
- Troops in a body, almost
- Old Bill suppressing resistance in ballet group
- Under discussion, heart unit
- Squadron is body that’s not totally complete
- Run into police group
- Army unit take in peOns, historically
- Police conceal redhead’s
Buddy explains!

The straight part
We know that "unit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unit = corps.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 CORPS mean?
CORPS noun- A battlefield formation composed of two or more divisions.
- An organized group of people united by a common purpose.
- A non-commissioned officer army rank with NATO code OR-4. The rank below a sergeant but above a lance corporal and private.
- A non-commissioned officer rank in the police force, below a sergeant but above a private or patrolman.
- A worker in charge of the wagonway, reporting to the deputy.
- The white linen cloth on which the elements of the Eucharist are placed; a communion cloth.
- A body corporate, created by law or under authority of law, having a continuous existence independent of the existences of its members, and powers and liabilities distinct from those of its members.
- The municipal governing body of a borough or city.
- In Fascist Italy, a joint association of employers' and workers' representatives.
- A protruding belly; a paunch.