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Coronets had distorted shapes (11)

Ross

I believe the answer is:

octahedrons

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'shapes' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.

'coronets had distorted' is the wordplay.
'distorted' indicates anagramming the letters.
'coronets'+'had'='coronetshad'
'coronetshad' is an anagram of 'OCTAHEDRONS'.

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I've seen this clue in The Telegraph.
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