*Certain ice cream or soap product

https://nytcrossword.info/hint/certain-ice-cream-or-soap-product

Cambridge sch. that sends out acceptance letters on Pi Day 

https://nytcrossword.info/hint/cambridge-sch-that-sends-out-acceptance-letters-on-pi-day

Singer Paul with the memoir “My Way”

https://nytcrossword.info/hint/singer-paul-with-the-memoir-my-way

Produce whoppers

https://nytcrossword.info/hint/produce-whoppers

Soy-based protein source 

https://nytcrossword.info/hint/soy-based-protein-source

Went kaput, as a battery 

https://nytcrossword.info/hint/went-kaput-as-a-battery