Crossword Genius

Some might say Hoskins is immortal on drugs (10)

Ross

I believe the answer is:

immoralist

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'some might say hoskins' is the definition.
I can't judge whether this definition defines the answer.

'is immortal on drugs' is the wordplay.
'on' says to put letters next to each other.
'drugs' is an anagram indicator (I've seen 'drugged' mean this).
'is' after 'immortal' is 'immortalis'.
'immortalis' is an anagram of 'IMMORALIST'.

Can you help me to learn more?

I've seen this clue in The Independent.
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