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