Still struggling I'm afraid.
12A - silver article on pipe broken in spring (8) I have ?G?N?P??
8D - his lenten stuff something of a red herring (5) I have N?S??
18D - such a device may have a bearing (8) I have ?E?A?D?E
Plus the continuing discussion about 19A
19A again:
"say" in clue suggests pun--here on "foresight," identical in sound to "Forsyte," which may be spotted in company with "saga." in title "The Forsyte Saga."
No more from me.