Get high with knockabout and some marijuana? (5)

I believe the answer is:

bhang

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'some marijuana?' is the definition.
(bhang is a kind of marijuana)

I can't explain the rest of the clue.

(Other definitions for bhang that I've seen before include "Hemp-based narcotic" , "cannabis" , "Narcotic used in India" , "Leaves and shoots of hemp" .)

I've seen this clue in the Sydney Morning Herald.

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