Smart singer? (5)
I believe the answer is:
sting
I believe this clue is a double definition.
'smart' is the first definition.
(both can mean to burn or hurt)
'singer' is the second definition.
(singer from The Police)
(Other definitions for sting that I've seen before include "carefully planned undercover operation" , "popstar" , "viz. Gordon Sumner" , "(Bee) wound" , "The pain caused by bee or nettle" .)