Instrument forming a bulge (5)

I believe the answer is:

bugle

'instrument' is the definition.
(bugle is a kind of instrument)

'forming a bulge' is the wordplay.
'forming' indicates anagramming the letters.
'bulge' with letters rearranged gives 'BUGLE'.

(Other definitions for bugle that I've seen before include "Trumpet-like instrument" , "Instrument used for military signals" , "costume ornament?" , "ornament for dress" , "Brass instrument; plant" .)

I've seen this clue in the Evening Standard.

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