Minute part (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">minute part</span>' is the definition.<br/ ><span class="explanation-format__explanation">('second' is part of 'minute')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for second that I've seen before include "Short time - back" , "Support, assist" , "Position of runner-up" , "Back-up; short time" , "Small fraction of a day" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">minute part</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 iota that I've seen before include "Old letter" , "letter from abroad" , "Grain" , "Tiniest scrap" , "A little piece" .)