Crossword Genius

Calculation of the sum (8)

Ross

I believe the answer is:

addition

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">calculation of the sum</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 addition that I've seen before include "One of the four basic planks of arithmetic" , "Simple kind of arithmetic" , "Arithmetical operation" , "Mathematical procedure" , "Supplement" .)

I've seen this clue in The Irish Times.
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