Crossword Genius

Calculation aid (5,8)

Ross

I believe the answer is:

ready reckoner

'calculation aid' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for ready reckoner that I've seen before include "Calculation aid" , "A whiz at mental arithmetic" , "table" , "Tables of standard numerical calculations" , "I've done your sums for you" .)

I've seen this clue in The Independent and The Sunday Times.
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