Man rued not carrying weapons (7)

I believe the answer is:

unarmed

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

'not carrying weapons' is the definition.
(I've seen this before)

'man rued' is the wordplay.
'man rued' can be anagrammed to 'UNARMED'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for unarmed that I've seen before include "Maunder (anag.)" , "Open" , "Like Venus de Milo" , "Not equipped with or carrying weapons" , "Having no means of defence" .)

I've seen this clue in The Irish Independent.

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