Broken gearbox stud after new clutch fitted

Hi guys, just had new clutch kit fitted........good. Gearbox stud broken where it bolts to subframe.......bad.

Was holding up, but had to pull across junction fast, and now clunks when changing gear, guess this is the cause ? Also when starting car, as it catches, there's a strange back n forth motion!!!!!! Again will this be the loose mounting?

Anyone local anyone can recommend to fix the stud cheaply?

Thx guys, just more stress!