Mendelssohn's cat? (5)
I believe the answer is:
felix
This could be a double definition.
'mendelssohn's' is the first definition.
(composer Felix Mendelssohn)
'cat?' is the second definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for felix that I've seen before include "M. name, literally happy" , "Chap" .)