Crossword Genius

Postal system (4)

Ross

I believe the answer is:

mail

'postal system' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for mail that I've seen before include "Letters and parcels" , "some self-defence material" , "Form of armour; post" , "protective cover" , "Paper" .)

I've seen this clue in The Telegraph and The Mirror.
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