Company adopting adult vice in place of gambling (6)
I believe the answer is:
casino
'place of gambling' is the definition.
'company adopting adult vice' is the wordplay.
'company' becomes 'co' (abbreviation).
'adopting' is an insertion indicator.
'adult' becomes 'a'.
'vice' becomes 'sin'.
'a'+'sin'='asin'
'co' placed around 'asin' is 'CASINO'.
'in' is the link.
(Other definitions for casino that I've seen before include "Scorsese film - Bond film if "royale"" , "enterprise?" , "Las Vegas establishment" , "Gambling venue" , "Gaming house" .)