Crossword Genius

Armoured protection for the post (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.

'armoured protection' is the first definition.
'mail' can be an answer for 'protection' (mail is a kind of protection). I am not sure about the 'armoured' bit.

'post' is the second definition.
(I know that post can be written as mail)

'for the' acts as a link.

Can you help me to learn more?

(Other definitions for mail that I've seen before include "Letters and parcels" , "some self-defence material" , "American post from Lima" , "Post in America" , "Armour of interlinked metal rings" .)

I've seen this clue in The Irish Independent.
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