On heroin somewhat with this? (5)

I believe the answer is:

habit

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'on heroin' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for habit that I've seen before include "Breaking this is hard" , "bent" , "Custom; clothing" , "Propensity" , "Riding garment" .)

I've seen this clue in The Times and The Sunday Times.

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