Bugle or trumpet (4)
I believe the answer is:
horn
I believe this clue is a double definition.
'bugle' is the first definition.
(thesaurus)
'trumpet' is the second definition.
(I know that trumpet can be written as horn)
(Other definitions for horn that I've seen before include "Musical instrument - antler" , "Musical instrument; Chile Cape" , "Instrument - rhino's feature" , "Hollow outgrowth and musical instrument" , "Instrument - rhino's appendage" .)