Crossword Genius

Armour for men, reportedly (4)

Ross

I believe the answer is:

mail

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

'armour' is the definition.
(mail is a kind of armour)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for mail that I've seen before include "Post or body armour" , "American post from Lima" , "Eg, letters" , "Post in America" , "Paper" .)

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