Crossword Genius

Unit of astronomical distance (6)

Ross

I believe the answer is:

parsec

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

This is the entire clue.

(Other definitions for parsec that I've seen before include "Astronomical length - scrape (anag)" , "Unit for measurement of distance of stars" , "3.26 light years" , "three and a quarter twenty sevens [LIGHT YEARS]" , "measure of universe" .)

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