Unobserved (6)

I believe the answer is:

unseen

'unobserved' is the definition.
(I know that unobserved can be written as unseen)

This is all the clue.

(Other definitions for unseen that I've seen before include "Concealed" , "Translation exercise" , "Unobserved" , "not spotted" , "Invisible or not observed" .)

I've seen this clue in The Irish Times and The Star Tribune.

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