Weight – worry (6)
I believe the answer is:
stress
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">weight</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">worry</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for stress that I've seen before include "'Worry, pressure (6)'" , "Dwell on" , "possible excuse for sickie?" , "what causes tension" , "Tension - accent" .)