We hear it has charms (5)
I believe the answer is:
music
'it has charms' is the definition.
The definition suggests a singular noun which matches the answer.
'we hear' is the wordplay.
I cannot really understand how this works, but
'we' could be 'us' and 'us' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for music that I've seen before include "Crafted sound" , "Vocal or instrumental sounds" , "Sweet sound." , "Harmonious sound (generally!)" , "'''If ... be the food of love, play on'' (Twelfth Night) (5)'" .)