Instrument in some Sydney-Congo Boeing flight? (4)

I believe the answer is:

oboe

I'm a little stuck... Click here to teach me more about this clue!

'instrument' is the definition.
(type of musical instrument)

'some sydney-congo boeing flight?' is the wordplay.
'OBOE' is hidden in amongst the letters.
However, I am uncertain how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for oboe that I've seen before include "Musical instrument" , "Slender double-reed instrument" , "Double-reed wind instrument" , "Double-reeded woodwind instrument" , "Orchestral piece" .)

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

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