Missile thrown in pub? (4)

I believe the answer is:

dart

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'missile' is the definition.
(I know that dart is a type of missile)

I don't understand the remainder of the clue.

(Other definitions for dart that I've seen before include "Small narrow pointed missile" , "Seasoned beef" , "Move quickly and suddenly" , "Fish < from River" , "Sudden quick movement" .)

I've seen this clue in The Sun.

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