Certain annuity plan (7)
I believe the answer is:
tontine
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">certain annuity plan</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 tontine that I've seen before include "life assurance scheme" , "Tin tone for a scheme of life annuity" , "financial scheme" , "financial enterprise" .)