"Taps” instrument (5)
I believe the answer is:
bugle
'taps instrument' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bugle that I've seen before include "'Last Post' instrument" , "An army trumpet" , "Brass instrument without valves" , "Bit of brass" , "one may have blown it!" .)