The most common and most likely answer to this crossword clue is the 7 letter word GUNFIRE
I've seen this crossword clue in The Daily Telegraph
G
U
N
F
I
R
E
Buddy explains!
The straight part
We know that "Discharges from the army?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case discharges from the army? = gunfire.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 GUNFIRE mean?
GUNFIRE noun- Shots from a gun or guns, typically creating loud report.
- The use of gunpowder-type weapons, mainly cannon, as opposed to swords or bayonets.
- The time of firing of the morning gun or the evening gun.
- Tea, a cup of tea, especially one served early in the morning before first parade.