Getting near the end now boys and girls.
21A Behind one's back, bishop is in Paris (6-4)
S ? C ? N ? - ? ? ? ?
Might be second best, but I don't know why.
24A Consumed pork pie provided by head of radio studio (7).
A ? E ? I ? ?
16D Encored piece of music I see pronounced as lacking in refinement (8).
? A ? ? ? ? ? ?
20D Like something functional setter and solver accomplished (6).
? ? ? B ? ?