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I have a full grid but cannot make any sense of the two columns made from the "linker" clues.

Sorted out the two columns now and highlighted the name. It is the "what else needs highlighting" which is stumping me.

Can you help me with “ Glum after foxtrot, power lacking in dancing impact (10). Begins with F

F + 3 letter synonym for sad + an anagram described by the last five words of the clue. There is no definition and it is a "linker clue". I only got it using google as it isn't in my BRB or Bradford's.

BTW, the clue length may be misleading,

Thank you gitto. The preamble was scary anyway. I don’t think I’m anywhere near but I’m grateful for the advice.

The preamble says that the final highlighting is 3 & 6, but having read more about the theme than I really wanted to know, it seems like it should instead be 3 & 10. What am I missing?

I am in the same position, though there is a 6 letter answer created by the "name" which unfortunately doesn't appear other than in rather scattered form. The 3 letter could be anything. I likewise have two connected devices, 6 and 3, which look right but aren't coherently in the grid. Stuck for the moment, and not inclined to scrabble around the grid for some acronym in this field which, let's face it, could be any set of letters!

All of the thematic items invented by our thematic person contain the connector character which leaves only two places in the grid that they can be.

That is to say, the column of first letters gives us a person X, and the column of last letters tells us we are looking for Ys. So if you Google "list the Ys invented by X" you will see that the first Y is 3 characters and appears in one row, and the final Y is 10 characters and appears in another row. So I am not sure what else we can be looking for,