At no time (5)
I believe the answer is:
never
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">at no time</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for never that I've seen before include "when hell freezes over?" , "On no occasion" , "No way" , "'It's now or - - ' (14 song)" , "' - - Say - - Again': Bond film" .)