Inverted commas used endlessly in magazine content (4)
I believe the answer is:
ammo
'inverted commas used' is the definition.
I can't tell whether this defines the answer.
'endlessly in magazine content' is the wordplay.
'endlessly in' becomes 'am' (I can't explain this - if you can you should give a lot more credence to this answer).
'magazine' becomes 'armory' (I've seen this in another clue).
'content' says to take the centre.
The centre of 'armory' is 'mo'.
'am'+'mo'='AMMO'
Can you help me to learn more?
(Other definitions for ammo that I've seen before include "Bullets, say, in short" , "rounds briefly" , "Bullets, shells, etc. (abbr.)" , "Bullets (sl.)" , "Bullets and bombs, etc (abbr)" .)