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I've had success with crumpled newspaper filling the void, a layer of mesh drywall tape and then applications of drywall mud (joint compound). The joint compound will shrink so you won't want to expect to fill the whole thing on the first coat. Use a wide putty knife, gently apply an even layer and let it dry overnight. Add another layer until it is filled in. If you don't get carried away and put it on neatly you will only have to smooth the finished drywall compound with a damp spong before painting.
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