Hi, Rusty!
Yes, I think you are right about the battery being a back up in case of a power cut.
Now that I come to think of it, our electric alarm clock works on the same principle. That also has a battery, so the time remains unaffected by an electrical shortage.
A sensible idea?
I have finished today's Jumbo GK, but am labouring a bit with the 15 x15?
I had not heard of "bhang" nor "proem"?
Although they were both easy enough to get from the parsing.
I had to look them up to check the definitions.
I'm stuck on 11a?
Do celebrities like Bauhaus? (13)
F?N?T?O?A?I??
As far as I am aware, Bauhaus is a German Art school?
"Functionalist" fits...but I can make no sense of it?
I can't do 7d either...so have no last letter for 11a.
Now, is "upsa -daisy" an answer to one of the clues that I haven't yet attempted?!
......or did you just "happen" upon it?
Maybe I need a coffee....... to alert the brain cells?
Although an ice-cream would go down better in this heat!
(I am sorry you have rain!)
Chris, Sorry...I have only just seen your earlier post!
Thank you for the clarification!