Glacial debris (7)
I believe the answer is:
moraine
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">glacial debris</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 moraine that I've seen before include "Rocky ridge deposited by a glacier" , "glacier deposit" , "Glacial deposit" .)