Some litterbug leaves his instrument (5)

I believe the answer is:

bugle

'instrument' is the definition.
(I know that bugle is a type of brass)

'some litterbug leaves his' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'BUGLE' is hidden within 'litterbug leaves his'.

(Other definitions for bugle that I've seen before include "It calls to soldiers" , "costume ornament?" , "Bit of brass" , "Military musical instrument" , "'Last Post' instrument" .)

I've seen this clue in the Sydney Morning Herald.

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