Not a disaster Keith it is going to happen all the time.
On the 1/48 Landrover they have made the dashboard with two beautiful wing mirrors. They were going to be broken off or bent. So I nipped them off to superglue back near completion.
On yours it is difficult to know the exact problem as there is nothing to scale it against. On these things good idea to photo with a coin etc.
Provided it is not going to be messed about with I would just glue it with superglue. If you have more work to do surrounding this piece I would leave glueing back until the latest moment practical.
What I have done with things like this is to use , as Dave has advised, just a smear.. Then you can get a Loctite superglue with a brush. I have given the piece just a very thin coating up and down the leg. Just gives that extra bit of strength.
Tried about 6 types of Superglue. The best I have found is Locktite. They do a Superfast and it is best I have found. Gives just the right time to get the stuff into position and then it is off. Also found if you want the Superglue really fast decant a small amount into a plastic container. leave say 10 minuts then use. It goes off like a rocket. used it on the Walrus
rigging which was a god send with 40 odd glue points.
They also do a Gel which is thicker and takes a little longer to go off. Noted that recently WHICH did test on a number of Superglues and Loctite came out top of the list.
Laurie