Crossword Genius

Margin authentic and celestial (8)

Ross

I believe the answer is:

sidereal

'celestial' is the definition.
(thesaurus)

'margin authentic' is the wordplay.
'margin' becomes 'side' (I've seen this in another clue).
'authentic' becomes 'real' (I've seen this before).
'side'+'real'='SIDEREAL'

'and' acts as a link.

(Other definitions for sidereal that I've seen before include "Of the stars or constellations" , "Realised (anag) -- relating to the stars" , "Of or measured by the stars" , "involving stars" , "Full of stars" .)

I've seen this clue in the Sydney Morning Herald.
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