Crossword Genius

Post that once provided personal protection (4)

Ross

I believe the answer is:

mail

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

This might be a double definition.

'post that once provided personal' is the first definition.
'mail' can be an answer for 'post' (synonyms). I am not certain of the rest of the definition.

'protection' is the second definition.
(I know that mail is a type of body armor)

Can you help me to learn more?

(Other definitions for mail that I've seen before include "Chain armour" , "Letters and parcels" , "some self-defence material" , "Armour; posted items" , "Send message" .)

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