Ford Escort gearbox or clutch defect?

Moin moin from the north I’m new here in the forum and urgently need your help! I recently added an Essi Bj 1995 privately, everything ran perfectly until yesterday…I was ready for a few kilometers and when I started on the federal road I put in the first gear and when I let the clutch come there was a hit in the gearbox and the car didn’t move a meter…the engine runs and the gears can be switched on but I don’t even need to kick the clutch for it… Does anyone know what it might be? What can you recommend me to proceed as I can…I guess around a workshop I don’t get around or? Cost point? Thank you in advance