Crossword Genius

Peevish with formal greeting showing arm (8)

Ross

I believe the answer is:

crossbow

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This clue might be a double definition.

'peevish with formal greeting' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'arm' is the second definition.
(crossbow is a kind of arm)

'showing' is the link.

Can you help me to learn more?

(Other definitions for crossbow that I've seen before include "Ancient weapon, shot bolts" , "Old weapon wiht mechanism for firing bolt" , "Weapon firing bolts" , "Weapon (used to set off a quarrel?)" , "One responsible for shooting bolts" .)

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