Drivers side rear brake dragging and heating up. All other brakes cool and functional

Rear brake, shoes, dragging and heating up on quest. Took off drum and all parts seem to be in place. The only way to get drum off was to bleed off some fluid. Any help appreciated

bad wheel cylinder
is my best guess since you said it's only on that affected area
or a clog in the line, but you said you bled it so that's not it
or how were the springs on the brake shoe assembly?
is the star-wheel adjuster assembly taken apart, cleaned, re-greased?
also cleaned and re-greased the sliding friction surfaces between the shoes and where they slide against the drum backing?