Hi Mazie
The Spectator crossword is a themed one and the unclued lights are all of a kind.
To get you started I can tell you that 6 of the clues are proper names, a 7th is two worded proper name any the final one is 1/2 (half) of a well known name.
As you may have gathered the oz in the title is not a weight measure but an abbreviation which will help you discover the theme.
Good luck.