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I have all the clues except:
34a Valley in stone recalled a prehistoric period (5) ??I?S
3d Unopended depressants for captians of warships (6) ??NE?S
34d Oxford crew rowing in Port Said but it's forbidden (6) ??RP?D
Hints appreciated.

ria is a valley
downers are depressants
anagram of port said without sa (its)

Thanks leon