Kicking can is nothing in a gambling den (6)
I believe the answer is:
casino
'a gambling den' is the definition.
(casino is a kind of gambling den)
'kicking can is nothing in' is the wordplay.
'kicking' becomes 'cas' (I am not sure about this - if you are sure you should believe this answer much more).
'can is' indicates an anagram (I've seen 'can be' mean this).
'nothing' becomes 'O' (looks like zero - 0).
'o'+'in'='oin'
'oin' anagrammed gives 'ino'.
'cas'+'ino'='CASINO'
Can you help me to learn more?
(Other definitions for casino that I've seen before include "Gaming club" , "Gambling place" , "Scorsese film - Bond film if "royale"" , "used by gamblers" , "Gambling house" .)