Century which means nothing for player's club (6)
I believe the answer is:
casino
'club' is the definition.
(thesaurus)
'century which means nothing for player's' is the wordplay.
I cannot really understand how this works, but
'century' could be 'c' (common abbreviation) and 'c' is found within the answer.
'nothing' could be 'no' (similar in meaning) and 'no' is present in the answer.
The remaining letters 'asi' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for casino that I've seen before include "--- Royale (Fleming)" , "Gambling place" , "Book by Ian Fleming" , "game of cards" , "Gaming house" .)