Piece about feline put in to start (7)
I believe the answer is:
toccata
'piece' is the definition.
(I know that toccata is a type of piece)
'feline put in to start' is the wordplay.
'feline' becomes 'cat' (cat is a kind of feline).
'put in' is an insertion indicator.
'to start' becomes 'toca' (I can't justify this - if you can you should give a lot more credence to this answer).
'cat' going inside 'toca' is 'TOCCATA'.
'about' is the link.
Can you help me to learn more?
(Other definitions for toccata that I've seen before include "technical challenge" , "Musical composition with rapid elaborate runs" , "Noted work" , "Flashy piece of music" , "Baroque keyboard composition" .)