Go on to Doncaster bypass maybe and prepare to shoot ahead (4,3)

I believe the answer is:

take aim

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'prepare to shoot ahead' is the definition.
(aiming a gun)

I don't understand the remainder of the clue.

(Other definitions for take aim that I've seen before include "train" , "Sight a target" , "Point a weapon at the target" , "Line up weapon" , "Penultimate order for those shooting" .)

I've seen this clue in The Telegraph.

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