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With which to shoot horse? (4)


I believe the answer is:


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'horse?' is the definition.
(I know that colt is a type of horse)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for colt that I've seen before include "Male horse under four years of age" , "Male foal" , "Early American revolver" , "Young Arab maybe" , "runner" .)

I've seen this clue in The Times.
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