A little night music (4)
I believe the answer is:
taps
'a little night music' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for taps that I've seen before include "They're faucets in America" , "Military bugle call at dusk" , "Uses listening devices" , "Knocks gently" , "Military signal to turn the lights out" .)