Lake surrounded by wilderness (4)
I believe the answer is:
erne
'lake' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'surrounded by wilderness' is the wordplay.
'surrounded by' says the answer is hidden in the clue.
'ERNE' can be found hidden inside 'wilderness'.
Can you help me to learn more?
(Other definitions for erne that I've seen before include "White-tailed eagle" , "flyer in the main" , "River and lake of the North" , "bird of prey" , "Light (a flame)" .)