Form of investment (4,5)
I believe the answer is:
unit trust
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">form of investment</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 unit trust that I've seen before include "Form of investment" , "Investment system" , "Investment package" , "Investment fund" , "Type of investment" .)