Association with the youngster round the corner (4)
I believe the answer is:
club
'association' is the definition.
(I know that association can be written as club)
'youngster round the corner' is the wordplay.
'youngster' becomes 'cub' (cub can mean a young person).
'round' indicates putting letters inside.
'the corner' becomes 'l' (I can't justify this - if you can you should believe this answer much more).
'cub' placed around 'l' is 'CLUB'.
'with the' acts as a link.
Can you help me to learn more?
(Other definitions for club that I've seen before include "Weapon for an association" , "Association - bludgeon" , "Eg, wood, brassie" , "Batter" , "Bat - society" .)