See title of post! Had a suggestion that the clutch cable needs tightening, but this seems too simple?

Its 100% ok going into every other gear, and sometimes ok going into reverse.

Help!

could be the cable.. always noticed it crunched if you were still slightly moving forward when you put it in. kinda expected really

make sure you fully stop.

loads of cars (new and old) crunch or knock going into reverse occasionaly.. could just be one of those things.