Quickly get out in the alley! (7)

I believe the answer is:

skittle

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'alley' is the definition.
('skittle alley' can be a synonym of 'alley')

I cannot understand how the rest of the clue works.

(Other definitions for skittle that I've seen before include "Pin in bowling game" , "Upset" , "Ninepin" , "Knock down" , "Pin in ninepins" .)

I've seen this clue in the Evening Standard.

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