Coins scattered across a gambling hall (6)
I believe the answer is:
casino
'gambling hall' is the definition.
(thesaurus)
'coins scattered across a' is the wordplay.
'scattered' is an anagram indicator.
'across' is an insertion indicator.
'coins' is an anagram of 'csino'.
'csino' placed around 'a' is 'CASINO'.
(Other definitions for casino that I've seen before include "Gambling emporium" , "You can win a fortune here" , "Gambling house" , "Gambling den" , "Gaming establishment" .)