If the green is showing for the entire length of the limb it will leaf out again but if the limb tip is brown cut the limb back until it starts showing green. I can't tell for sure about the graft but it appears to be growing on its own roots and is not grafted. What did the fruit it grew last year taste like? Sweet or bitter? If it was bitter then the grafted part, the upper portion above the graft has died and the tree is useless and should be removed. If the fruit was sweet and tasted like an orange should, then all that the tree needs is fertilizing and severely pruned to get all of the dead wood out.Lemon tree next to it
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