Hello, Elle!
Yes, Avogadro was maybe in another puzzle.
I only do the Times Monday to Saturday.
One a day is plenty for me!
25, "Come by" is "get", "ramble" is "gad",
"device" is "gadget".
17, The "daily" is the newspaper "I", "example" is "say" (though it would be better as "for example").
"Goodness" is the definition", "I say".
Some of the clues were a bit rambly, I think.