Explosive articles packed into magazine? (4)

I believe the answer is:

ammo

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'explosive' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ammo that I've seen before include "Contents of magazine" , "that goes in magazine: ...?" , "Slugs perhaps" , "Bullets, shells, etc. (abbr.)" , "eg Bullets, shells" .)

I've seen this clue in The Sun.

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