Glass instrument? (5)

I believe the answer is:

flute

I believe this is a double definition.

'glass' is the first definition.
(flute glass is a kind of glass)

'instrument?' is the second definition.
(flute is a kind of instrument)

(Other definitions for flute that I've seen before include "Narrow wineglass" , "Musical instrument - wineglass" , "Wind instrument" , "Blown" , "High-pitched woodwind instrument" .)

I've seen this clue in The Independent and the Evening Standard.

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