Nit-picking (8)
(Other definitions for niggling that I've seen before include "Annoying slightly" , "Persistently annoying" , "Arguing over petty things" , "Small and of little importance" , "Irritating and persistent" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nit-picking</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 pedantic that I've seen before include "Overly concerned with insignificant detail" , "Abstruse" , "Insisting on sticking stricktly to the rules" , "Excessively concerned with minor detail" , "Overly concerned with minor details" .)