Crossword Genius

Calculation aid (5,8)

Ross

I believe the answer is:

ready reckoner

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

(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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