Stylish seconds displayed by marketplace (5)
I believe the answer is:
smart
'stylish' is the definition.
('smart' can be similar in meaning to 'stylish')
'seconds displayed by marketplace' is the wordplay.
'seconds' becomes 's'.
'displayed by' means one lot of letters go next to another.
'marketplace' becomes 'mart' ('mart' can be a synonym of 'marketplace').
's'+'mart'='SMART'
(Other definitions for smart that I've seen before include "having chips in" , "Stylish; sting" , "Well turned out" , "Fashionable" , "turned out nicely" .)