30 D. Primarily, berths enabling dosing sessions. (4) I'm more likely to be ??????? than dosing.
31 Some name for pole circuit with little depth (4) I think the overlooked letter works well in the first word.
I didn't come up with anything satisfactory for 35 A, but I am sure I have the correct letter as I'm finished.
PS. For those without the paper, this was themed and 'the definition in each clue has overlooked a letter'.