Music scene etc I abandoned for intellectually demanding activity (6,7)
I believe the answer is:
rocket science
'intellectually demanding activity' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'music scene etc i abandoned' is the wordplay.
'music' becomes 'rock' (rock is a kind of music).
'abandoned' indicates anagramming the letters.
'scene'+'etc'+'i'='sceneetci'
'sceneetci' with letters rearranged gives 'etscience'.
'rock'+'etscience'='ROCKET SCIENCE'
'for' is the link.
Can you help me to learn more?
(Other definitions for rocket science that I've seen before include "Space technology" , "Proverbial activity requiring greater intelligence?" , "Something very difficult to understand (involving gravity?)" , "(Not) an intellectual demand (slang)" , "Something said to require great intelligence (usually referred to in the negative)" .)