Crossword Genius

The distance is simply astronomical (6)

Ross

I believe the answer is:

parsec

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'the distance' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for parsec that I've seen before include "Unit for measurement of distance of stars" , "Large unit of distance" , "Unit of astronomical distance - scrape (anag)" , "Astronomical length - scrape (anag)" , "it takes years to get this far" .)

I've seen this clue in the Evening Standard.
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