Crossword Genius

Very early calculator (6)

Ross

I believe the answer is:

abacus

'very early calculator' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for abacus that I've seen before include "What was counted on" , "means of multiplying" , "this adds up" , "Old counting-frame" , "Counting machine" .)

I've seen this clue in The Irish Times.
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