Bring a flier to a striking conclusion (4)

I believe the answer is:

swat

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'conclusion' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for swat that I've seen before include "'Twas quite a smack" , "Hit with a sharp blow" , ".`Twas quite a blow" , "Smack (a fly?)" , "Kill (fly)" .)

I've seen this clue in the Evening Standard.

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