Without deviation (8)
I believe the answer is:
straight
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">without deviation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for straight that I've seen before include "Respectable" , "not gay" , "Not curved or bent" , "Direct, having no deviations" , "Serious" .)