Having totally failed to make any headway with last week's puzzle, I've managed to redeem myself (a little) this time. I have a completed grid, and have found the framed works and their surroundings, but I'm still head-scratching over parses of three clues:
12 - I thought the extra letter would be C, which with the first two letters of the answer, yields a kind of wheel. Extra appears to be E
15 - Couldn't unravel the wordplay at all! Filled in from definition and adjoining letters.
42 - First 4 letters give 'endlessly seek', and there looks like a partial anagram for the rest of it, but it wouldn't quite work for me. Is this where the final missing S should come from?
Thanks in advance!
David