Help?

Does anyone know what this might be?

I suspect it of being a fruit tree. It’s self seeded in a bed I was prepping, and was hiding behind a tomato. It’s shot up in the last week  and I have to decide whether to transplant it or bin it. But I’d like to know what it is first, because it’s in clay soil so it’s not going to be easy to dig up – is it worth the bother?

This is not the only thing having a growth spurt in my garden. On Sunday, the kiwi fruit was finally, finally reaching out a tendril towards the verandah. Sunday evening it had made it. Monday morning, four more tendrils were following it, and it was creeping up the rail. I had to run out and buy some wire to start trellising it. That’s been the last three evening, putting trellises on basically every upright structure, some with shadecloth behind the wire to stop the plants burning in this wicked sun we’re having. Very satisfying to not feel behind the eight ball for once. I’m sure it won’t last but I’m enjoying it while it does.