Crossword Genius

Opiate isn't derived from this plant (10)

Ross

I believe the answer is:

poinsettia

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

'this plant' is the definition.
The definition and answer can be both plants as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'opiate isn't derived from' is the wordplay.
'derived from' indicates anagramming the letters.
'opiate'+'isnt'='opiateisnt'
'opiateisnt' anagrammed gives 'POINSETTIA'.

Can you help me to learn more?

(Other definitions for poinsettia that I've seen before include "American plant" , "poisonous bush" , "Shrub often given at Christmas" , "Plant with showy bracts, usu. red, pink or white" , "House plant, popular at Christmas -- tiniest OAP (anag)" .)

I've seen this clue in The Independent.
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