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Thought that earlier but then it shouldn`t be able to be pushed down the hose so scrapped that idea.I think the black item in the end of the Hose is a non return valve and it's being jammed in by the spigot on the trap.
Either don't push the hose on as far as you have been doing before tightening the clip or measure how far up the hose the vavle is and cut the waste spigot down to that length minus about 10mm. (so there's a gap between the end of the spigot and the valve)