Crossword Genius

Weapon a cavalryman will know how to handle? (4)

Ross

I believe the answer is:

colt

I'm a little stuck... Click here to teach me more about this clue!

'weapon' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for colt that I've seen before include "Young Arab maybe" , "Youngster" , "Type of American revolver" , "H [HORSE]" , "Mount" .)

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