Obtain rare elements finding anomaly (10)

I believe the answer is:

aberration

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

'anomaly' is the definition.
(I've seen this before)

'obtain rare elements' is the wordplay.
'obtain rare' can be anagrammed to 'ABERRATION'.
But, I am not sure how the anagram is indicated.

'finding' is the link.

Can you help me to learn more?

(Other definitions for aberration that I've seen before include "Straying" , "irregularity" , "Wandering" , "moral lapse" , "Deviation from normality" .)

I've seen this clue in The Telegraph.

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