Cats love playing a bit of music (7)
I believe the answer is:
toccata
'music' is the definition.
(toccata is a kind of music)
'cats love playing a bit' is the wordplay.
I cannot really see how this works, but
'love' could be 'o' (In tennis, 'love' means 'zero') and 'o' is located in the answer.
'playing' could be 'at' (I've seen this in other clues) and 'at' is found in the answer.
'a' is present in the answer.
This explanation may well be incorrect...
'of' is the link.
(Other definitions for toccata that I've seen before include "Flashy piece of music" , "Touching piece" , "Baroque musical composition" , "Musical composition for keyboard to show technique" , "lively piece" .)