9a - centre of revolution needs a high boundary round (4). Defn = centre of revolution. Ans - think cricket in terms of a boundary shot reversed against A
12. Noisy broadcast watches TV series with a will (4,7)
Defn = TV series. Noisy = sounds like to Broadcast + types of watches
19d Pinched fingers to leave trapped (5)
defn = pinched. Answer embedded in the clue