I believe those are red herrings. Forget the asterisks for now if you can. The message is key. The penultimate word of it is a six-letter plural. 7d has the same anagrind as popped up in the corrected clue a fortnight ago. Not the last word
Cockie @40 - my way into the endgame was very much the same as Dodgepot describes. You will also find that the "TEC'S CRIME TITLES" is not an irrelevant random phrase.
Greengage, if you have the message correctly you will see that it asks you to treat different cells in different ways. Mindful of the name you’ve already identified, that might suggest a path forward
An obvious way to represent the 6 grey cells suggests itself for sure, dodgepot, but the others - for me - not so much. Dim sum, as a a partly Latinised Anglo might say....