Betting house is a con unfortunately (6)
I believe the answer is:
casino
'betting house' is the definition.
(thesaurus)
'is a con unfortunately' is the wordplay.
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'is'+'a'+'con'='isacon'
'isacon' is an anagram of 'CASINO'.
(Other definitions for casino that I've seen before include "Scorsese film - Bond film if "royale"" , "Gaming club" , "gambling organisation" , "Gambling house" , "gambling joint" .)