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 "Counting machine" , "An old counting frame with beads" , "An ancient counting frame with beads" , "Old calculator" , "Basic calculator makes" .)

I've seen this clue in The Independent, the Sydney Morning Herald, The Times, The Mirror and the Evening Standard.

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