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Cannabis with change of direct­ion makes crystal, perhaps (5)

Ross

I believe the answer is:

glass

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'crystal perhaps' is the definition.
(crystal is a kind of glass)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for glass that I've seen before include "barometer" , "Container for drinking from" , "Drink container" , "Something to drink from" , "Goblet" .)

I've seen this clue in The Guardian.
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