overboard (9)
I believe the answer is:
excessive
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">overboard</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for excessive that I've seen before include "Too much" , "Disproportionate" , "Over the top" , "Immoderate" , "More than is desirable" .)