Person carrying weapon like a bandit (3-5)

I believe the answer is:

one-armed

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

'weapon like a bandit' is the definition.
I can't tell whether this definition defines the answer.

'person carrying' is the wordplay.
'person' becomes 'one' ('one' can mean an unspecified person).
'carrying' becomes 'armed' (I've seen this in another clue).
'one'+'armed'='ONE-ARMED'

Can you help me to learn more?

(Another definition for one-armed that I've seen is " A slot machine is considered to be this type of bandit".)

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