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Still trying to "fathom" your hint, ajh: do you mean their position relative to one another in the grid? S'thing to do with "Under"? Do you think that's relevant? After all, 28a is not even a location!
Signed "Somewhat Lost" (where I thought at first the pattern was relatively simple)!

You have no need to apologise either!I think it is a more specific area where the second group "comes from" that is both the "theme" and relates to the first.A bit convoluted but trying not to give answer directly for others.

Thank you for your response, ajh! In that case I'm beginning to think maybe we agree completely: it's difficult to say exactly where we are all obliged not to let too much of the cat out of the bag!!!