Mathematical procedure (9)
I believe the answer is:
algorithm
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mathematical procedure</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for algorithm that I've seen before include "Step-by-step solution method - oral might (anag)" , "Set of rules (for computer) to solve a problem" , "What, as a rule, helps maths student" , "Problem-solving formula" , "Step-by-step method for problem solving" .)