Ingenious sting! (5)
I believe the answer is:
smart
This clue is a double definition.
'ingenious' is the first definition.
(thesaurus)
'sting' is the second definition.
(thesaurus)
(Other definitions for smart that I've seen before include "Bright; sting" , "Sort of card" , "Intelligent; sting" , "Posh" , "Sting - witty" .)