Crossword Genius

Take heroin away from neighbour with infection (3)

Ross

I believe the answer is:

bug

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'infection' is the definition.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for bug that I've seen before include "Disease-germ" , "Software fault" , "Tap" , "Computer glitch" , "Harmful microorganism" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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