Fashionable society has a place to buy and sell (5)
I believe the answer is:
smart
'fashionable' is the definition.
(similar in meaning)
'society has a place to buy and sell' is the wordplay.
I cannot really see how this works, but
'society' could be 's' (common abbreviation in names of organisations) and 's' is present in the answer.
'a' is found in the answer.
The remaining letters 'mrt' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for smart that I've seen before include "astute" , "Chic; sting" , "Clever or dapper" , "Quick; tidy; sting" , "Bright or dapper" .)