The unclued lights (15 words in total) are to be arranged to provide a definition from Chambers of one of the normal clues which is NOT defined.

Across

9Worst of anything I kept in home (10)

14Agreement apparently penniless lecturer returns (3)

16Menus beginning with a cold collation – mostly spicy stuff (6)

17Faulty parachute doesn’t open (5)

18Dissident bishop in part of film (5)

20Less heavy boat used in docks (7)

22Various grebes, say, at end of lake (7)

25Arab picked up the vernacular (5)

26Drink in press release? (5)

28Narcissistic folk say it’s so fantastic (7)

31Such clothes horrify sappers indoors (7)

33Threatening look of the French pilgrimage destination (7)

37They mixed...