Post Irishman erected (4)

I believe the answer is:

mail

'post' is the definition.
(synonyms)

'irishman erected' is the wordplay.
'irishman' becomes 'liam' (I've seen this before).
'erected' says the letters should be written in reverse (in a down clue, letters go up).
'liam' in reverse letter order is 'MAIL'.

(Other definitions for mail that I've seen before include "some self-defence material" , "Paper" , "Post or body armour" , "Flexible armour" , "letter?" .)

I've seen this clue in The Daily Mail.

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