Bach piece from feline in tattered coat (7)
I believe the answer is:
toccata
'bach piece' is the definition.
(I've seen this in another clue)
'feline in tattered coat' is the wordplay.
'feline' becomes 'cat' (cat is a kind of feline).
'in' means one lot of letters goes inside another.
'tattered' indicates anagramming the letters.
'coat' is an anagram of 'toca'.
'cat' inserted within 'toca' is 'TOCCATA'.
'from' acts as a link.
(Other definitions for toccata that I've seen before include "lively piece" , "Musical composition with rapid elaborate runs" , "High-speed keyboard piece" , "Musical composition for keyboard to show technique" , "Keyboard composition emphasising technique" .)