As you listen, I sing something sweet (5)
I believe the answer is:
icing
'sweet' is the definition.
(thesaurus)
'as you listen i sing something' is the wordplay.
I cannot really understand how this works, but
'as' could be 'in' (I've seen this in other clues) and 'in' is located in the answer.
'i' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for icing that I've seen before include "The sweetest part of the cake" , "effect of cold weather" , "Cake topper" , "Topcoat" , "Cake covering" .)