Fish bone? (7)
I believe the answer is:
herring
This might be a double definition.
'fish' is the first definition.
(herring is a type of fish)
'bone?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
Can you help me to learn more?
(Other definitions for herring that I've seen before include "Sea fish" , "Fish of northern waters, can be salted or pickled" , "Saltwater fish" , "Fish, often kippered" , "It's certainly fishy!" .)