Counting-frame (6)

I believe the answer is:

abacus

'counting-frame' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for abacus that I've seen before include "Old calculator" , "Counting machine" , "Calculating frame" , "Beaded counting frame" , "frame of sorts" .)

I've seen this clue in The Irish Times and the Evening Standard.

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