Superstar picked up by gangbuster for loafing (8)
I believe the answer is:
idleness
'for loafing' is the definition.
(synonyms)
'superstar picked up by gangbuster' is the wordplay.
'superstar' becomes 'idol' (idol can mean a celebrity).
'picked up' indicates a 'sounds like' (homophone) clue.
'by' means one lot of letters go next to another.
'gangbuster' becomes 'ness' (I can't explain this - if you can you should give a lot more credence to this answer).
'idol' sounds like 'idle'.
'idle'+'ness'='IDLENESS'
Can you help me to learn more?
(Other definitions for idleness that I've seen before include "State of inactivity" , "Disinclination to work" , "I'm having nothing to do" , "Inactivity, indolence" , "Lazy quality" .)