"Thank You" singer (4)
I believe the answer is:
dido
'thank you singer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dido that I've seen before include "The old queen" , "Lover of Aeneas" , "---- and Aeneas, opera by Purcell" , "Classical suicide" , "Founding queen of Carthage (did next to nothing!)" .)