Crossword Genius

Running drug, possibly dangerous sort of bandit (3-5)

Ross

I believe the answer is:

one-armed

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

'dangerous sort of bandit' is the definition.
I can't judge whether this definition defines the answer.

'running drug possibly' is the wordplay.
'running' becomes 'on' (eg when a machine is running it is on).
'drug' becomes 'e' (E is another name for ecstasy).
'possibly' becomes 'armed' (I can't justify this - if you can you should give a lot more credence to this answer).
'on'+'e'+'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".)

I've seen this clue in The Times.
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