Crossword Genius

Early calculator (6)

Ross

I believe the answer is:

abacus

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

This is the entire clue.

(Other definitions for abacus that I've seen before include "Counting device" , "An old counting frame with beads" , "Old counting-frame" , "Counting machine" , "that one can count on" .)

I've seen this clue in the Irish Times (Simplex), the Penny Press, The Sun and the King Feature Syndicate.
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