Crossword Genius

Symbol in list provides some ammunition (6)

Ross

I believe the answer is:

bullet

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

'ammunition' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for bullet that I've seen before include "High-speed projectile" , "Gun projectile" , "Slug" , "Small missile from gun" , "Something fast moving" .)

I've seen this clue in The Mirror.
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