Hill by a loch (4)
I believe the answer is:
brae
'hill by a loch' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for brae that I've seen before include "Upland area in Scotland" , "Bear up on Scottish hillside" , "bank on Clydeside" , "Steep bank or hillside" , "Sloping bank (Scottish)" .)