Grouse and carp (4)
I believe the answer is:
beef
This might be a double definition.
'grouse' is the first definition.
(synonyms)
'carp' is the second definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'and' acts as a link.
Can you help me to learn more?
(Other definitions for beef that I've seen before include "Complaint; strength" , "Complaint; muscle" , "Argument" , "Brawn; complaint" , "Type of meat" .)