Running drug, possibly dangerous sort of bandit (3-5)
I believe the answer is:
one-armed
'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".)