4d) Chefs ring base mistakenly for reference documents (9) C??E?????
13a) Ex-president confirms his obedience to Samurai code (7) ????I??
16d) Hairy scary creature, thanks to natural evolution (9) no letters
18d) Avoid heart surgery (6) no letters.
29a) Jets roar away over new house in Greek deception (6,5) T????? ????E
Many thanks for any help.