16d) He collects duckweed (3) H??
(19a) Papers strongly advise adopting, say, gold barometer (8,5)
P?E?S??? ????E
20d) Representative's run out first in easy victory (4) ??M?
21d) Christian's kind, I assumed (7) ??N????
31a) We'd returned to Yarmouth to see duke, 30 perhaps? (4,4)
All help greatly appreciated