More accurate (5)
I believe the answer is:
truer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">more accurate</span>' is the definition.<br/ ><span class="explanation-format__explanation">('true' can be similar in meaning to 'accurate')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for truer that I've seen before include "More in accordance with fact" , "More accurate" , "More real" , "That's more like it" , "More exact" .)