Quick bite? Lunch organised (2,3,4)
I believe the answer is:
in the club
'quick' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'bite? lunch organised' is the wordplay.
'organised' indicates anagramming the letters.
'bite'+'lunch'='bitelunch'
'bitelunch' with letters rearranged gives 'IN THE CLUB'.
Can you help me to learn more?
(Other definitions for in the club that I've seen before include "putting on weight?" , "Expecting" , "Possibly accepted" , "Pregnant (slang)" , "not to have been blackballed?" .)