Musical gang and alien people flying for pleasure (3,3)
I believe the answer is:
jet set
'people flying for pleasure' is the definition.
'jet set' can be an answer for 'people' (I have seen 'rich people' mean 'jet set' so perhaps 'people' could also mean 'jet set'). I am unsure of the 'flying for pleasure' bit.
'musical gang and alien' is the wordplay.
'musical gang' becomes 'jets' (gang in West Side Story).
'and' says to put letters next to each other.
'alien' becomes 'et' (extra terrestrial).
'jets'+'et'='JET SET'
Can you help me to learn more?
(Other definitions for jet set that I've seen before include "Wealthy frequent travellers" , "Rich people who fly about a lot" , "Fast-living group" , "Wealthy elite" , "trendy travellers" .)