The most common and most likely answer to this crossword clue is the 7 letter word BATTERY
I've seen this crossword clue in The Daily Telegraph
B
A
T
T
E
R
Y
More clues leading to the result BATTERY
- It's no use if it's flat as a pancake?
- Sort of farm that stores electricity
- A cell where assault might lead
- Violent crime in connected cells
- Personal attack? One may be charged
- Violent act, a bit like pancake mix?
- Crazy about the Queen’s source of power
- By introducing odd treat, it makes poultry grow faster
- Artillery associated with assault
- It may be charged, or one may be charged with it
Buddy explains!

The straight part
We know that "Artillery" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case artillery = battery.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 BATTERY mean?
BATTERY noun- A device used to power electric devices, consisting of a set of electrically connected electrochemical or, archaically, electrostatic cells. A single such cell when used by itself.
- The infliction of unlawful physical violence on a person, legally distinguished from assault, which includes the threat of impending violence.
- A coordinated group of artillery weapons.
- An elevated platform on which cannon could be placed.
- An array of similar things.
- A set of small cages where hens are kept for the purpose of farming their eggs.
- The catcher and the pitcher together
- Two or more major pieces on the same rank, file, or diagonal
- A marching percussion ensemble; a drumline.
- The state of a firearm when it is possible to be fired.
- Apparatus for preparing or serving meals.