Bears a message from: "Don't come unarmed" (6,4)

'don't come unarmed' is the definition.
I know nothing about this answer so I can't tell whether this works.

'bears a message from' is the wordplay.
I cannot really understand how this works, but
'message' could be 'word' (word is a kind of message) and 'word' is present in the answer.
'from' could be 'in' (I've seen this in other clues) and 'in' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?