If its an old banjo then best to stay with animal glue but you will need to heat it, if its a one off and you don't want to buy a glue pot then a tin can in a saucepan of water will do, someone like Axminsters will have the glue. The advantage of this type of glue is that any repairs can be redone in the future just by the application of heat and a little water.
If you want a modern adhesive then Titebond do a liquid form of animal glue or there is alphatic resin which I use on new veneered work.
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