Missing last 5 on Prize, all need to be solved, have an extra letter added, anagrammatised and inserted. Help with parsing very gratefully received:
LHS: 10a Small book by Lawrence, poet (6) .e.a.t Needs c adding. 13d Plane figure spoil, we’re told, on corner (5,5) g.e.t/.n.l. (I think). Needs u adding. RHS: 9d Iconoclast disturbing seed at hole (5,6) .r.d./s.c... Needs t adding. 19a stuff (half the crimson stuff) (5) .a.c. Needs h adding. 22a (Not sure if this is the whole clue) Cycling to far-off square for US outside broadcasts (2,6) .t/.e.o.. Needs j adding.