Kind of plane or projection (6)

I believe the answer is:

astral

'kind of plane or projection' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for astral that I've seen before include "Related to the stars" , "To do with stars on altars" , "like a star" , "19 [STELLAR]" , "Like the stars" .)

I've seen this clue in the Wall Street Journal and the New York Times.

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