Shooting at flying saucers! (5)

I believe the answer is:

skeet

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'shooting' is the definition.
(US shooting sport)

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

(Other definitions for skeet that I've seen before include "Form of clay pigeon shooting" , "US version of a shooting sport involving clay pigeons" , "American clay pigeon shooting" , "A form of clay-pigeon shooting" .)

I've seen this clue in the Evening Standard.

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