Simple test - put the gearbox in first , run the car at idle and listen, now put it in neutral, fully stopped, release the clutch and listen : if the noise is quieter then the defect is in one of the bearings from the shafts inside the gearbox; if the noise is louder is in one of the gear sprockets or its synchro rings.
In either case the gearbox will have to be dismantled and the faulty part replaced a job only a repair shop can do. It will be expensive so be prepared for a stiff bill.
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