1/44 (eight words in total) is part of a question (in ODQ) minus a word exemplified by the other unclued lights (one hyphened). The title suggests a further example (eight letters) which will appear diagonally in the grid and must be shaded.

Across

11 Very good not quite excellent dish (4)
13 Awful prig with patent for round engine part (10, hyphened)
15 Gorilla regularly painting (3)
16 Bill’s mate collecting resin (7)
17 Sons prod skinflint (6)
19 British clown’s problem part of skull (6)
24 Don from near Grimsby is out jogging (5, two words)
26 Country seat with plonk where footballers play (9, two words)
28 Maximum...