Crossword puzzle clue "sit in to keep warm"

" . . . sit in ___/To keep . . . warm"

Grammy nominated singer with the 2015 album "Sometimes I Sit and Think, and Sometimes I Just Sit"

Where a cat might sit when you sit down

They'll keep you warm in winter

Keep the eggs warm

Itchy way to keep warm?

It can keep your head warm

"I have this duty on my farm / To look as chickens keep eggs warm"