Crossword Genius

In base eight (5)

Ross

I believe the answer is:

octal

'in base eight' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for octal that I've seen before include "Working in base 8" , "with unusual base" , "Relating to the number 8" , "Pertaining to a number system with 8 as its base" , "(Of maths) in base eight" .)

I've seen this clue in the Sydney Morning Herald, the LA Times, The Times and the King Feature Syndicate.
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