The unclued lights (one hyphened and one pair) are of a kind.

        Across

   4    Swollen state of tailless bird’s head (9)

10    Evil mix of love and malice (10)

14    Cox for Hereford, perhaps? (5)

16    Henry and John’s outcry (6)

22    Cow strays from foaming watercourse, maybe marked with X (8)

23    False topaz from urban area by river without divided youth hostel (7)

24    Nostradamus, say, translated Erse (4)

25    Like a couple dating, wasting time (4)

27    Insubstantial tune arranged round America (7)

34    Moans at this bridge (5)

35    Keeps quiet, it seems, having approval to act (3-2)