Where gambling may be seen as an offence in company (6)
I believe the answer is:
casino
'where gambling may be seen' is the definition.
(I've seen this before)
'an offence in company' is the wordplay.
'an' becomes 'a'.
'offence' becomes 'sin' (I've seen this before).
'in' is an insertion indicator.
'company' becomes 'co' (abbreviation).
'a'+'sin'='asin'
'asin' placed inside 'co' is 'CASINO'.
'as' acts as a link.
(Other definitions for casino that I've seen before include "Building for gambling" , "Gambling emporium" , "Where our betters show" , "Where some gamblers go" , "Gambling-club" .)