to brew for the second time
醱 centers on a specific brewing process: fermenting something a second time, as in double-fermentation.
醱 combines 酉 (sake jar, related to fermentation) with 發, which likely contributes the sound and the idea of 'sending out' or 'starting', fitting the concept of initiating a second fermentation.
The sake jar 酉 on the left and 發 (suggesting 'start' or 'send out') on the right: imagine starting a second round of brewing in the jar, sending out more bubbles.
For ハツ, picture a brewer wearing a hat while starting the second fermentation: hat -> ハツ, and the hat keeps the brew warm.