Crossword Genius

Medicine or drug no-one returns (6)

Ross

I believe the answer is:

potion

I'm a little stuck... Click here to teach me more about this clue!

'medicine' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'drug no-one returns' is the wordplay.
'drug' becomes 'pot' (slang term for cannabis).
'one' becomes 'i' (Roman numeral).
'returns' says the letters should be written in reverse.
'no'+'i'='noi'
'noi' backwards is 'ion'.
'pot'+'ion'='POTION'

'or' acts as a link.

Can you help me to learn more?

(Other definitions for potion that I've seen before include "Drink, maybe philtre" , "Medicinal draught" , "Magical liquid" , "Witches' brew" , "brew of Getafix?" .)

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