Crossword Genius

Lacking any order, depending on chance (6)

Ross

I believe the answer is:

random

(Other definitions for random that I've seen before include "Patternless" , "Lacking regularity" , "Lacking a pre-planned pattern" , "Happening by chance, haphazard" , "Without a particular aim or purpose - say a choice" .)

I've seen this clue in The Irish Times.
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