Crossword Genius

Magazine's explosive content? (4)

Ross

I believe the answer is:

ammo

I'm a little stuck... Click here to teach me more about this clue!

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

'content?' is the wordplay.
I cannot quite see how this works, but
'content?' could be 'am' (AM is an example) and 'am' is located in the answer.
The remaining letters 'mo' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ammo that I've seen before include "Bullet" , "round" , "What's fired from a gun (abbr)" , "What's fired from guns (abbr)" , "arms" .)

I've seen this clue in The Times.
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