2642: A cipher to decode

The unclued lights (including one of three words, one of two words, two hyphened and one pair) have nothing in common.

Across

11    Get sober people welcoming sober person home (6)

12    Litotes newspaper plugs seem so funny (7)

15    Poser’s strain (6)

18    Distributed case for delicate key (5)

19    Engineers, mature but not weak, assemble again (7)

23    Yale men amended hydrocarbon (7)

24    Dyes quiet clothing queen returned (6)

25    Scientist’s anxiety with traveller (8)

26    Relative admits unknown crime in legal institution (5,3)

27    Moan from Sun King, grabbing queen a whiskey (6)

28    Second judge computing speed (3-4)

33    A failing besetting a miser, ultimately? (7)

34    Old men...