shrivelled up, dried up, vexed
癟 centers on a state of depletion and distress: something shrivelled or dried up, and the vexation that comes with that withered condition.
癟 is a rare character whose historical development is uncertain. It visually combines 疒 (sickness) with 自 and 侖, but the exact origin of this composition is not well documented.
Under the sickness enclosure 疒, the self 自 is trapped in a withered, shrivelled state, like a person dried up and vexed by illness.
For ハツ, imagine a shrivelled hat that has dried up in the sun: hat -> ハツ, and the withered hat matches the kanji's meaning of being shrivelled and dried up.