2d) A month in South America or somewhere in Polynesia (5) S?M?A
15d) Ideas for a broadcast referred to earlier (9) A?O?????D
20d) Smart one caught in trap (4) N???
21d) Shearer's former tea importer? (7) C?????R
23a) Chemical expert, team leader baffled CIA and police (6,4) A????? ????
All help greatly appreciated