Loch name (4)
I believe the answer is:
ness
'loch name' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ness that I've seen before include "Where you're reputed to see monster" , "Scottish Lough containing legendary monster" , "Headland, promontory" , "Scottish loch - headland" , "Famous loch" .)