The example of positive feedback to indirectly maintain homeostasis is the chemical reactions involved in blood clotting.
In this process, when a blood vessel is damaged, chemicals are released that accelerate the clotting process, leading to the formation of a clot more quickly. This is a positive feedback mechanism, as the initial response (clotting factor activation) causes an amplification of the process until the bleeding is sufficiently stopped, thereby indirectly helping to maintain homeostasis.