Crossword Genius

Early calculator (6)

Ross

I believe the answer is:

abacus

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">early calculator</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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 Sun, the Irish Times (Simplex), the Penny Press and the King Feature Syndicate.
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