Youngster carrying large stick (4)
I believe the answer is:
club
'stick' is the definition.
(club is a kind of stick)
'youngster carrying large' is the wordplay.
'youngster' becomes 'cub' (I've seen this in other clues).
'carrying' means one lot of letters goes inside another.
'large' becomes 'l'.
'cub' enclosing 'l' is 'CLUB'.
(Other definitions for club that I've seen before include "In which one could be expecting" , "Association of people with similar interests" , "Staff - association" , "woman expects to be in" , "Dance venue" .)