Remain uncommitted (3,2,3,5)
I believe the answer is:
sit on the fence
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">remain uncommitted</span>' is the definition.<br/ ><span class="explanation-format__explanation">(to sit on the fence is to refuse to take sides)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sit on the fence that I've seen before include "Remain undecided" , "refuse to support either side" , "Refuse to decide" , "Avoid committing oneself; be neutral" , "Refuse to commit oneself" .)