Clamping wood at odd angles?

truth

New member
I have made a headboard out of ash. Approximately 60" wide and 32"deep. I want to make say four cuts at like a few degrees each and then glue the pieces so that once rounded off the piece has a gentle curve from mattress to top of HB at the wall. I got that I have to biscuit join the pieces but how to clamp them? Every time I think of some sort of clamp fix I just see those joints collapsing on themselves. Appreciate it. Thanks
 
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