Tom, in new coat, makes freestyle keyboard composition (7)
I believe the answer is:
toccata
'keyboard composition' is the definition.
(I've seen this before)
'tom in new coat makes freestyle' is the wordplay.
I cannot really understand how this works, but
'tom' could be 'cat' (a tom is a male cat) and 'cat' is present in the answer.
an anagram of 'coat' is 'toca' which is present in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for toccata that I've seen before include "Noted work" , "Musical work designed to show player's technique" , "Flashy piece of music" , "Keyboard piece emphasising touch" , "technical challenge" .)