The most common and most likely answer to this crossword clue is the 8 letter word MAGAZINE
I've seen this crossword clue in The Daily Telegraph
M
A
G
A
Z
I
N
E
More clues leading to the result MAGAZINE
- Supply of ammo that could be monthly
- Amazing Grace finally out for publication
- Arsenal‘s publication
- Look mostly in state for source of firepower
- … periodical for crosswords and powder
- Arsenal play amazing final in Europe
- Publication that may be packed with explosive material
- Cartridge for printed part of Sunday paper
- Periodical may include explosive material
- Arsenal keeper’s third amazing calamity
Buddy explains!

The straight part
We know that "Publication/that may be packed with explosive material" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case publication/that may be packed with explosive material = magazine.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 MAGAZINE mean?
MAGAZINE noun- A non-academic periodical publication, generally consisting of sheets of paper folded in half and stapled at the fold.
- An ammunition storehouse.
- A chamber in a firearm enabling multiple rounds of ammunition to be fed into the firearm.
- A reservoir or supply chamber for a stove, battery, camera, typesetting machine, or other apparatus.
- A country or district especially rich in natural products.
- A city viewed as a marketing center.
- A store, or shop, where goods are kept for sale.