Place to gamble on savings account, Charlie having retired (6)
I believe the answer is:
casino
'place to gamble' is the definition.
(I've seen this in another clue)
'on savings account charlie having retired' is the wordplay.
'savings account' becomes 'ISA' (Individual Savings Account).
'charlie' becomes 'C' (phonetic alphabet).
'having retired' shows that the letters should be reversed in order.
'on'+'isa'+'c'='onisac'
'onisac' reversed gives 'CASINO'.
(Other definitions for casino that I've seen before include "Gambling-club" , "Where our betters show" , "You can win a fortune here" , "Where one may gamble" , "Gaming place" .)