A mathematical process (8)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a mathematical process</span>' is the definition.<br/ ><span class="explanation-format__explanation">(addition is a kind of mathematical process)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for addition that I've seen before include "Calculation of the sum of numbers" , "Arithmetic calculation" , "Annexe" , "Mathematical process" , "One of the four basic planks of arithmetic" .)
(Other definitions for division that I've seen before include "Military grouping" , "Large army unit" , "some police?" , "Parliamentary vote" , "Section; maths process" .)