Stipulation (7)
I believe the answer is:
proviso
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stipulation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that proviso is a type of stipulation)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for proviso that I've seen before include "Condition of stipulation of an agreement" , "Condition added to an agreement" , "Something insisted upon as part of an agreement" , "Requirement" , "Rider" .)