Crossword Genius

Codeine source (5)

Ross

I believe the answer is:

opium

'codeine source' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for opium that I've seen before include "wars with China" , "Poppy-based drug" , "where horse originally came from?" , "Poppy drug" , "Dried juice of white poppy" .)

I've seen this clue in The Sunday Times and The Times.
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