Eventually commit oneself (4,3,6)
I believe the answer is:
take the plunge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eventually commit oneself</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 take the plunge that I've seen before include "Finally decide" , "Summon up courage" , "to leave the board" , "Eventually commit oneself" , "Decide on bold action" .)