Crossword Genius

A graduate copper's calculating device (6)

Ross

I believe the answer is:

abacus

'calculating device' is the definition.
(I've seen this before)

'a graduate copper's' is the wordplay.
'graduate' becomes 'BA' (someone with a Bachelor of Arts degree).
'copper's' becomes 'Cu's' (chemical symbol).
'a'+'ba'+'cus'='ABACUS'

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

I've seen this clue in The Daily Express.
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