Jazz fan, in bed, lifted by ace composition (7)
I believe the answer is:
toccata
'composition' is the definition.
(I know that toccata is a type of composition)
'jazz fan in bed lifted by ace' is the wordplay.
'jazz fan' becomes 'cat' (slang term for a jazz fan).
'in' means one lot of letters goes inside another.
'bed' becomes 'cot' (cot is a type of bed).
'lifted' shows that the letters should be reversed in order (going up in down clue).
'by ace' becomes 'a' (abbreviation. I am not sure about the 'by' bit.).
'cot' back-to-front is 'toc'.
'toc'+'a'='toca'
'cat' going inside 'toca' is 'TOCCATA'.
Can you help me to learn more?
(Other definitions for toccata that I've seen before include "Musical work designed to show player's technique" , "Keyboard piece emphasising touch" , "Keyboard composition emphasising technique" , "Flashy piece of music" , "Baroque keyboard composition" .)