Jazz fan appearing in different music show (8)
I believe the answer is:
indicate
'show' is the definition.
(I know that show can be written as indicate)
'jazz fan appearing in different music' is the wordplay.
'jazz fan' becomes 'cat' (slang term for a jazz fan).
'appearing in' means one lot of letters goes inside another.
'different music' becomes 'indie' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cat' placed within 'indie' is 'INDICATE'.
Can you help me to learn more?
(Other definitions for indicate that I've seen before include "(Give a) signal" , "Make a signal" , "Point out, suggest" , "Point out, make known" , "Point, show, signal" .)