Logarithms inventor (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">logarithms inventor</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 napier that I've seen before include "one bringing in logs" , "New Zealand port" , "NZ coastal city" , "Log producer" , "John --, Scottish mathematician" .)