Where Neagh is, lough: duck found therein? (3)
I believe the answer is:
nil
'where neagh is lough duck found therein?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
This is the entire clue.
Can you help me to learn more?
(Other definitions for nil that I've seen before include "Latin zero" , "There's nothing left" , "You get nothing" , "Nothing, zero" , "0" .)