Third-party account (6)
I believe the answer is:
escrow
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">third-party account</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for escrow that I've seen before include "Legal instrument" , "document held by third party" , "fund held in trust?" , "Something held until a condition is fulfilled" , "back-up security" .)