Not identified, curiously mundane ... (7)

I believe the answer is:

unnamed

'not identified' is the definition.
(I've seen this before)

'curiously mundane' is the wordplay.
'curiously' is an anagram indicator.
'mundane' anagrammed gives 'UNNAMED'.

(Other definitions for unnamed that I've seen before include "Without designation" , "Not identified in mundane way" , "Nude man (anag) - not identified" , "Not identified, lacking appellation" , "not placed in speech" .)

I've seen this clue in The Everyman puzzle in The Observer.

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