Monster loch (4)
I believe the answer is:
ness
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">monster loch</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 ness that I've seen before include "Loch of monster fame" , "Loch in the Great Glen" , "Scottish Loch famed for monster" , "Scottish Lough containing legendary monster" , "Scottish loch - headland" .)