Add brown sugar, honey, Dijon, cinnamon, cloves, nutmeg and allspice to a small saucepan over medium heat.
Cook, whisking regularly, for 2-3 minutes. Remove from heat.
Pour the water into the bottom of the Instant pot inner pot.
Place the ham in the Instant pot inner pot.
Set aside half of the glaze.
Brush the ham liberally with the other half of the glaze.
Close and lock the lid. Be sure that the pressure release valve is set to sealing. Select manual high pressure and adjust the time to 16 minutes. It should take about 10-15 minutes for the pot to reach pressure.
Let the pressure release naturally for 10 minutes, then turn the pressure release valve to venting to release any remaining pressure.
Check the temperature to be sure that the ham has reached 145F. If the ham hasn't, cook for 5 more minutes on manual high pressure.
Let the ham cool slightly, then carefully remove from the pot.
Brush with remaining glaze and serve warm.
Notes
Ham: It's important that the ham be precooked and spiral sliced. Otherwise, the ham will have a different cooking time.
Mustard: Brown mustard also works well. Feel free to increase the mustard to 2 tablespoons for stronger mustard flavor.
Vinegar: If you'd like a bit of tang to cut some of the sweetness in the glaze, add 2 tablespoons of apple cider vinegar to the glaze.