4 down
Drug
money
(5)
Drug money (5)
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The definition is at the beginning of the clue.
How the clue works
This one's a double definition, with no wordplay to untangle. Drug works because sugar is slang for a narcotic such as heroin or LSD, and money works because sugar is also slang for cash. Both halves point at the same word, and that's all there is to it.