Perhaps the last thing that might strike you (6)

I believe the answer is:

bullet

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'strike you' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for bullet that I've seen before include "Revolver missile" , "Have attraction" , "Small missile from gun" , "Projectile ammunition" , "High-speed projectile" .)

I've seen this clue in the Evening Standard.

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