Exactly correct (4-2)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">exactly correct</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 spot-on that I've seen before include "Perfect" , "'Exactly right (4,2)'" , "Informally precise - no post required" , "On the button, precisely so" , "Completely accurate" .)
(Other definitions for spoton that I've seen before include "precise" , "precisely what is needed" , "very accurate" , "Exactly!" .)