Such elements are rather exotic (4-5)

I believe the answer is:

rare-earth

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'such elements' is the definition.
'rare-earth' can be an answer for 'elements' (rare-earth element is a kind of element). I am unsure of the 'such' bit.

'are rather exotic' is the wordplay.
'exotic' is an anagram indicator (an unusual form of the letters).
'are'+'rather'='arerather'
'arerather' with letters rearranged gives 'RARE-EARTH'.

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I've seen this clue in the Sydney Morning Herald.

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