Brown's a survivor! (5)
I believe the answer is:
liver
This clue could be a double definition.
'brown's' is the first definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'a survivor' is the second definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
Can you help me to learn more?
(Other definitions for liver that I've seen before include "Hepatic organ" , "Glandular organ of the stomach" , "Bodily organ" , "Human organ" , "Part of body" .)