Crossword Genius

According to the rules (2,3,4)

Ross

I believe the answer is:

by the book

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">according to the rules</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for by the book that I've seen before include "Strictly following rules" , "According to the rules" .)

I've seen this clue in The Guardian.
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