South American flower of unusual petal design (5)

I believe the answer is:

plate

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

'south american flower of unusual' is the definition.
I can't judge whether this defines the answer.

'petal design' is the wordplay.
'design' is an anagram indicator.
'petal' anagrammed gives 'PLATE'.

Can you help me to learn more?

(Other definitions for plate that I've seen before include "Salver" , "Cover with metal" , "Coat with metal" , "Leapt (anag.)" , "horseshoe" .)

I've seen this clue in The Globe and Mail.

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