Peculiarity; phenomenon (6)

I believe the answer is:

oddity

This clue is a double definition.

'peculiarity' is the first definition.
(I know this)

'phenomenon' is the second definition.
(thesaurus)

(Other definitions for oddity that I've seen before include "Curious item" , "Strange person/thing" , "Quirk" , "Curious thing" , "Toy did (anag.)" .)

I've seen this clue in The Guardian.

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