Crossword Genius

Mendelssohn's pet? (5)

Ross

I believe the answer is:

felix

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This could be a double definition.

'mendelssohn's' is the first definition.
(composer Felix Mendelssohn)

'pet?' is the second definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for felix that I've seen before include "Chap" , "M. name, literally happy" .)

I've seen this clue in the Evening Standard.
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