Sting is well turned out (5)
I believe the answer is:
smart
I believe this clue is a double definition.
'sting' is the first definition.
(I know that sting is a more specific form of smart)
'well turned out' is the second definition.
(I've seen this before)
'is' acts as a link.
(Other definitions for smart that I've seen before include "Neat - clever" , "Fine" , "Clever; sting" , "fly" , "Elegant and stylish" .)