Around the perimeter clockwise from square 1 goes a quotation in ODQ minus its last word. This last word suggests the remaining unclued lights, a final example of which (6) must be highlighted in the completed grid.
Across
11 Jam is an Asian food (6)
12 US record nut with some bread (6)
15 I’m surprised after soldier deserted tree in Oz (6)
17 Petrol is running around a rock (9)
20 Two newspapers probing rotten thief’s birthday (8)
21 Question about mince pie resembling dairy product (6)
23 Card player, for instance, in film (4)
26 Gnome fixed cutter’s tool (3,3)
28 Latvian regularly ignored after excessive interval (6)
31 ...

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