A charmer, we hear (5)
I believe the answer is:
music
'a charmer' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'we hear' is the wordplay.
I cannot really understand how this works, but
'we' could be 'us' and 'us' is located in the answer.
The remaining letters 'mic' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for music that I've seen before include "Composed sound" , "'My - - ' , radio quiz" , "A score represents it" , "Aural entertainment" , "'If ... be the food of love, play on'(Twelfth Night)" .)