Three unclued lights are a musician (two words) and a quotation of his (four words), which suggests the other six unclued lights, all anagrams of words of a kind (one of two words). 

Across

8 Delaying intro, ace ruler (4)

11 Posh earl pokes you abroad in part of eye (6)

12 Bill eating corn in earnest (5)

17 I’m leaving rupees for Turkic speaker (5)

18 Cat heard in forest (5)

19 Sally’s Samoyed’s caught rabies (5)

21 Mist by lake in wood (5)

22 A hobo, on line, snaps here (5)

24 Energy field in Greek colony (4)

26 Tour of e.g.