Crossword Genius

Astronomical unit of distance (6)

Ross

I think it could be either:

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6

5,4

'astronomical unit of distance' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for parsec that I've seen before include "Unit for measurement of distance of stars" , "far in the distance" , "Unit of astronomical length" , "Enormous distance" , "Unit of distance in astronomy" .)

I've seen this clue in the Universal, The Guardian and The Times.
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