Short of bullets? (4)
I believe the answer is:
ammo
This might be a double definition.
'short' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'bullets?' is the second definition.
(I've seen this before)
'of' acts as a link.
Can you help me to learn more?
(Other definitions for ammo that I've seen before include "that goes in magazine: ...?" , "round" , "Bullet" , "Bullets, shells (colloq.)" , "essential supplies for soldiers" .)