Crossword Genius

Magic drug, not a thing helping save Romeo (4,6)

Ross

I believe the answer is:

love potion

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

'save romeo' is the definition.
The definition suggests a singular noun which matches the answer.

'magic drug not a thing helping' is the wordplay.
I cannot really understand how this works, but
'drug' could be 'pot' (slang term for cannabis) and 'pot' is located in the answer.
'not' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for love potion that I've seen before include "Magic drink stimulating desire" , "preparation for it" , "Aphrodisiac needed!" .)

I've seen this clue in The Sunday Times.
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