Hand montage

Hello, i have montage with 1 frame: character hold hand close to face (like he speaking phone, u know)
How can i make it work in game?)
simple hold hand like inside montage)

i tried to make special clavicle-slot and blend it in anim-BP, then in montage apply this slot., then play montage - delay as it lenght - play again., so montage playing, but char always dragging with hand up-down (pretty funny move:D)., but isn’t just hold it