Generous one
I believe the answer is:
donor
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">generous one</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for donor that I've seen before include "Generous type" , "Organ giver?" , "contributor" , "One giving something" , "One who gives, maybe blood" .)