Mix brown sugar, pineapple tidbits with juice and ground cloves in a medium bowl.
Add 1 cup of water to Instant Pot insert, place trivet inside. Set the ham, cut side down, on the trivet. Pour pineapple brown sugar mixture over ham.
Close lid, press “manual” or “pressure cook” setting and set the timer to 15 minutes. The IP will take about 13 minutes to come to pressure.
Once done, let the Instant Pot release the pressure naturally. It will take about 10 minutes (it was 9.5 minutes for me). Carefully open the lid and remove ham onto a cutting board. Let it rest for 10 minutes.
Make the pineapple brown sugar mixture: whisk cornstarch and water in small bowl. Press "saute" setting on your Instant Pot, bring it to a boil. Add cornstarch mixture and cook for about 2 minutes, or until it thickens. Cornstarch makes the glaze clear. If you will use flour, it will be cloudy.
Slice ham and serve with glaze.