An element of odium, iris being trimmed for nothing (7)

I believe the answer is:

iridium

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'an element' is the definition.
(iridium is a kind of element)

I can't explain the rest of the clue.

(Other definitions for iridium that I've seen before include "Element, symbol Ir" , "Hard silvery metal" , "Silvery-white metallic element" , "Silvery-white metal" , "Metallic element resistant to corrosion, atomic no. 77" .)

I've seen this clue in The Daily Express.

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