Strained state (7)
I believe the answer is:
tension
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">strained state</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tension that I've seen before include "Assay" , "The effect of force exerted in or on something" , "Strained state" , "nerves" , "Stretched, uneasy, condition" .)