It can't be explained (7)

I believe the answer is:

mystery

'it can't be explained' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for mystery that I've seen before include "Something strange and inexplicable" , "enigmatic type" , "Unexplained happening" , "Puzzling crime novel" , "Something baffling" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).

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