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21 D. The end of surface treatment that's not hard (5) ?i??s
28. Scout from days gone by not once about to become exhausted (6) ??tire
There may be a misprint in either/both of these clues.

Just got 21 D.

re(about)tire

Thanks, but I don't think it can be 'retire'. 21 Down, clue in my first post, is Finis(h)- this means 28 A is now ?ntire .
I'm debating entire/intire.

Entire and the misprint is t as in stout rather than scout

Ta - got it earlier.

Has anyone any idea of the highlighting?

feathers below?

Yes I have "feathers below" - is it an anagram?

No - you just need a synonym for each of those words, to give you the location itself.